1. automotive and vehicles
2. cars

 HeritageClassicClass
Rationale:ThepurposeofHeritageClassic(HC)istoenableenthusiastsofsportscarsandsedans
fromtheearlyyearsoftheSCCAtoparticipateatSCCASoloeventswithcarsofsimilartechnol‐
ogy.Thisparticipationcanrangefromthosewantingtoseethesecarsinacompetitionsetting,
tothosejustwantingtodrivetheirclassiccaraggressively,tothoseseekingseriouscompeti‐
tion.ThecoreobjectiveistoprovideafunexperienceforHeritageClassiccarenthusiasts.
Background:Thesecarsfromthe1940’sthroughthe1970’sareanimportantpartofthehistoryof
notonlytheSCCA,butoftheAmericanautomotivesceneandareworthyofbeingapartofthe
SCCAtodaysothishistoryisnotforgotten.TheHeritageClassicclassisintendedtoencourage
theuseandenjoymentofthesecarsbytheirownersandothereventattendees. Assuch,the
rulesrepresentalevelofcarpreparationthatreflectsthehalcyoncompetitivedaysofthese
cars‐themid‐1970s. ThisrulesettimeframehasbeenpurposelyselectedtoattractProduc‐
tioncarsandSedansofthisera,ascurrentlynoothernationalorganizationoffersanoppor‐
tunityforthesecarstocompeteinthisconfigurationastypicallytherulesareeitherlimitedto
1972andearlierversionsORtheseheritagevehiclesmustcompeteagainstmoremoderntech‐
nologyvehicles.
Invitation:SCCARegionsareencouragedtooffertheHeritageClassicclassasawaytoenticeavid
enthusiastswhostillhave,orwishtobuild,racepreparedcarsofthiseratobringtheircarsto
yourautocrosssite.ThiswillprovideanopportunityformembersoftheSCCA,autoenthusiasts,
andthegeneralpublictoenjoywatchingand/ordrivingthesefoundationalcarsandjointhe
funatyourSCCASolo®events!
3/19/2015
HC‐1
HERITAGECLASSICPREPAREDCLASS
HC.0.A.Intent
It isthe intent ofthese rules to allow modifications useful and necessary inthepreparation of a high
performance, production based non‐street‐driven vehicle. SCCA® will use the following guidelines in
thedeterminationofsuitabilityforclassificationintheHeritageClassicPreparedClass:
1.Carsclassifiedshallretaintheiroriginaldesign,structure,anddrivelayoutunlessotherwisespecified
intheserules.Ifindoubtaboutamodification,competitorsshouldask.Iftherulesdonotspecifically
authorizeamodification,itisnotpermitted.
2. Cars running in Heritage Classic (HC) Prepared Class musthavebeen series produced withnormal
roadtouringequipment,capableofbeinglicensedfornormalroaduseintheUnitedStates,andnor‐
mallysoldanddeliveredthroughthemanufacturer’sretailsalesoutletsintheUS.Carsnotspecifi‐
callylistedinHCPreparedClassclassintheHCAppendixmusthavebeenproducedinquantitiesof
atleast1000ina12‐monthperiodtobeeligible.
3. SCCA®mayalsoclasssuitablenon‐production,full‐bodied,full‐fendered,strictly‐specifiedcarsinto
this class. Production quantities, EPA approval, and DOT approval are not required. SCCA® may
choosenottoclassifyanysuchvehicleitdeemsunsuitablefortheHCPreparedClass.
4.Withinthescopeoftheserules,theterms“chassis”referstotheminimalconfigurationofacarnec‐
essarytocontainalloftherunninggear(drivetrain,suspension,&steering)andtoprovidesupport
forthebody.Forcarsof“frameless”construction,thechassisisthecentralcontiguousassemblyof
stressedpanelsandsubframeswhichformthebasicstructurenecessarytocontainalltherunning
gearofacar.
5. Specific allowances in the HC Appendix for a listed model supersede the limitations of these rules.
Minimumweightsshallbeestablishedmakingitpossibleforallcarstoreachminimumweightwith
reasonable modifications. These rules shall discourage the use of high technology/high cost equip‐
ment.Insomecases,thisisaccomplishedbyanoutrightbanontheequipment.Inothercases,thisis
accomplishedthroughtheadjustmentstominimumweight.SeeHC.17.11forweightadjustments.
HC.0.B.Specifications
TheSCCA®shallpublishspecificationsforeachcarspecificallyclassedintheAppendixoftheHeritage
Classic Prepared. These specifications will at a minimum specify each vehicle’s allowed minimum
weightandmaximumwheelsizes.
1.Equipmentand/orspecificationsmaybeexchangedbetweendifferentyearsandmodelsofavehicle
if:
a.theitemisstandard ontheyear/modelfromwhichitwastaken,and b.theyears/modelsarelistedonthesamelineoftheHCAppendix.Theupdated/backdatedpartor
the part to which it is to be attached may not be altered, modified, machined, or otherwise
changedtofacilitatetheupdating/backdatingallowanceunlessthemodificationisspecificallyal‐
lowedbytheserules.CarsnotlistedintheHCAppendixmaynotbeupdated/backdateduntilpub‐
lishedintheofficialSCCA®publicationand/oronwww.scca.com.
2. The SCCA® may recognize certain optional components. Some non‐original components may be
made mandatory to obtain an adjustment of competition potential. In all cases, these components
shallbelistedintheHCAppendix.Nopermittedoralternatecomponentormodificationshalladdi‐
tionallyperformaprohibitedfunction.
3.Requestsforalteration,modification,and/orsubstitutionofanyspecificationorcomponentshallbe
submittedforapproval.Theapprovalprocesswillinclude,butnotbelimitedto,ananalysisofcost,
availability,performanceimpact,ruleenforceability,andcompetitorinput.
SeeSections3.8and8.3.1oftheSCCA©Solo©Rulesfordocumentationrequirements.
3/19/2015
HC‐2
HC.1AUTHORIZEDMODIFICATIONS
ThemodificationsdefinedhereintheHCPreparedClassaretheonlyallowedmodifications.Theserules
standontheirown;theydonotbuilduponothercategoryrules.Modificationsshallnotbemadeunless
specificallyauthorizedherein.Nopermittedcomponent/modificationshalladditionallyperformaprohib‐
itedfunction.Iftherulesdonotspecificallyauthorizeamodification,itisnotpermitted.
A.Itisnotpermittedtomakeanychanges,alterations,ormodificationstoanycomponentproducedbythe
manufacturerunlessspecificallyauthorizedbytheserules.
B.Anyminormodification,intendedtoalloworfacilitateanyallowedmodification,ispermittedaslongas
it does not provide any intrinsic performance benefit in and of itself, and is not explicitly prohibited
elsewherewithintheserules.Thisruleisintendedtoallowminornotching,bending,clearancing,and
grinding;thedrillingofholes;affixing,relocating,orstrengtheningofbrackets;removalofsmallparts
andsimilaroperationsperformedinordertofacilitatetheinstallationofallowedpartsormodifications.
Competitors are strongly cautioned to make the minimum amount of modification required to affix a
given part and to not make tortured interpretationsofthis rule. (e.g., movingframe rails inboard, re‐
gardlessofthereason,isconsideredtobeatorturedinterpretation.)
HC.2BODYWORKANDSTRUCTURE
The purpose of the following rules is to maintain recognizable external features of the manufacturer’s
make and model, while providing the necessary safety and performance modifications. Restrictions re‐
gardingexternalbodyshapeandbellypansareaimedatpreventingattemptstoobtaingroundeffectsor
streamlining.
A.Theexternalshapeofthebodymayonlybechangedwherespecificallyauthorized.Standardwindow
openings,raingutters,orapprovedfacsimilesshallberetained.Allexternaltrimandmodelidentifica‐
tionmayberemoved.Grillesmayberemoved,modified,orsubstituted.
B.Chassis,frame,orsubframemaybereinforcedprovidedcomponentsandattachmentsarenotrelocated
exceptwherespecificallypermitted.Reinforcingdoesnotauthorizetheuseofunderbodyorbellypans
forward ofthe firewall oraftof thefront edge oftherear wheel opening. It is permittedto have jack
pointsrecessedintotherockerpanelsortohaveonetubepersideextendingdownwardthroughthe
bottomofthedoorprovidedtheydonotextendbeyondtheoverallwidthofthecarorinanunsafeor
dangerous manner. No part of the bodywork or chassis, to the rear of the front wheel opening, shall
touchthegroundwhenbothtiresonthesamesideofthecararedeflated.
C.Thechassis,frame,orsubframemaybenotchedorcutandbracketsmaybeaddedforthepurposeof
attachingalternatesuspensionordrivetraincomponentsexceptthatthefirewallmaynotbemodified
forengineblockorcylinderheadclearance.Holesmaybecuttoprovideclearanceforauthorizedsus‐
pension and drivetrain components through their entire range of travel. Additional structure may be
addedinordertoattachallowedcomponentstothechassis.
D.Replacementofanychassiscomponent(e.g.,subframe)initsentiretybyoneofalternateconstruction,
unlessspecificallypermitted,shallresultinthevehiclebeing“inexcess”oftheserulesandweightpen‐
altiesand/orcompetitiveadjustmentsmayapply.
E.Thefloorinthedriver/passengercompartmentmaybemodifiedforinstallationofsubframeconnect‐
ors,exhaustcomponents,andfordriveshaftclearance.Whenmodified,thedriver/passengercompart‐
mentmustremainseparatefromanyexhaustanddriveshaftcomponents.Themodifiedareamustbe
steeloraluminumandnomorethana4.0”(101.6mm)clearanceisallowedbetweenmodifiedfloorar‐
eaandexhaustormodifiedfloorareaanddriveshaftcomponents.
Trunkfloorsmaybemodified,removed,orreplaced.Ifreplaced,thetrunkfloormustbereplacedwith
metalpanelsofsimilarshapetotheoriginal.Removalofthetrunkfloorisallowableonlywhenametal
bulkheadseparatesthetrunkareafromthepassengercompartment.
F.Thefirewallmaybenotchedorrecessedforclearanceofexhaustheaders,electriclines,coolantlines,
3/19/2015
HC‐3
fuel‐carryinglines,fuelpumps,intercoolingpiping,carburetors,airhorns,aircleaners,anddistributor.
Any material added to the firewall must be either steel or aluminum. This requires a sealed firewall
between engine and passenger compartment. This rule is for driver’s safety. Completely sealing all
firewallopeningsisstronglyencouraged,butnogapmaybelargerthan⅛inch(0.125”,3.2mm),except
arounddynamicdevicesextendingthroughthefirewall(e.g.,throttlelinkage,transmissionlinkage,or
othermechanicaldevices)andshouldbesealedtotheextentthatfunctioningofthedeviceisnotim‐
paired.Nomorethan8.0”(203.2mm)clearanceisallowedbetweenmodifiedfirewallareasandabove
listedcomponents. The engine block,cylinder head,turbochargers,and/or superchargers may not in‐
trudeintotheclearanceareasauthorizedherein.
G.Bumpercomponentsnotintegraltothebodyworkmaybemodified,substitutedwithareplicaofalter‐
natematerial,orremovedprovidedallprojectinghardwareisalsoremoved.Bumperbracketholesin
thebodyworkmaybecoveredprovidedsuchcoveringservesnootherpurpose.Bumperfasciasintegral
withthebodyworkmaybemodifiedorsubstitutedwithareplicaofalternatematerial.Internalbumper
components may be removed, replaced, or modified. Modified or replica bumpers/fascias must be of
similar shape as standard components, completely cover the area of the OE bumper/fascia, and not
confusetheidentityofthevehicle.
H. All interior trim, dash boards, gauges, floor covering, carpet, upholstery panels, and similar
non‐performancecomfortorconvenienceitemsmayberemovedorreplaced.
I.Thedriver’sseatmaybereplacedwithaseatofanyorigin.Allpassengerseatsmayberemovedorre‐
placedwithseatsofanyorigin.Thedriver’sseatmustremainonthestandardsideofthecarandmay
notcrossthecenterlineofthecar.Theseatmayberelocatedfore/aftbyupto12.0”(30.5cm)basedon
the centerline of the original front and rear mounting points. Rear bulkhead of the driver/passenger
compartmentmaynotberemovedtorelocatetheseatandthedriver’sseatmaynotextendrearward
pastthebulkhead.
J.Doorsmaybelightenedandmaybereplacedbyonesofalternatematerials.Doorsmaybepinned,but
notbolted,topreventtheiropeningincaseofanaccident.Quickreleasefasteners(e.g.,Dzusfasteners)
areallowed.Standarddoorhingesandlatchmechanismsmayberemoved,butthedoorsshallbecapa‐
bleofbeingopenedorremoved.Interiordoorpanelsmayberemovedorreplacedandthedoorwindow
slotsmaybecovered.Alternateattachmentdevicesmaybeaddedtohoodanddecklidtosupplement
orreplacethelatches.Hoodanddecklidhingesmayberemoved.
K.Windows
1. All windowsmay be replaced withpolycarbonatematerial. Thefront windshieldshall have a mini‐
mumthicknessof⅛inch(0.125”,3.16mm).Tintingoftheupperportionofthefrontwindshieldand
theentireportionofallotherwindowsisallowed.Allwindowreplacementsshallremaininthesame
positionintheframeoropeningastheoriginalglassitreplaces;rubbermoldingisoptional.
2.Allwindowchannelsandwindowwindingmechanismsmayberemoved.
3.Closedcars:Allsidewindowglassmayberemoved.Allrearhatchbacksanddecklidsshallbecom‐
pletelyclosed;pooralignmentofbodyworkoranyothermeanstopreventcompleteclosureisnot
permitted.
4.Opencars:Allwindowsandwindshields(includingwindshieldframes)mayberemoved.Theresult‐
ingwindowslotsmaybecovered.
5.Theinstallationofwindshieldsafetyclips,rearwindowsafetystraps,andwindshieldsafetystrapsis
permitted.
L.Thecontourofthefendermaybealtered(flared)fortireclearanceprovidedthemodificationsdonot
confusetheidentityofthecar.Onlystandardproductionventilationopeningsonthespecificrecognized
modelarepermitted.Tiresmayextendbeyondthebodywork.Fenderwheelopeningsmaybetrimmed
toprovidetireclearancethroughoutthefullrangeofsuspensiontravel,butnomorethanisnecessary
forthispurpose.
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HC‐4
M.Innerfenderpanelsseparatingthewheelwellsfromtheenginecompartmentmaybealtered,replaced,
orremoved.Rearinnerfenderpanelsmaybealtered,replaced,orremovedprovidedtherearepanels
providing total separation between driver/passenger compartment and wheels. A shock/strut tower
integraltotheinnerfenderpanelisconsideredpartoftheinnerfenderpanelandisincludedinthisal‐
lowance.Thisdoesnotallowmodificationofframe/framestubsbeyondSectionHC.2.C.
N. Replacement, addition, or removal of accessories (gauges, switches, indicators, etc.), or other interior
modificationsfordriverconvenience,ortopermitinstallationofrequiredsafetyequipment,isauthor‐
izedprovidedsuchmodificationshavenoinfluencewhateveronthemechanicalperformanceofthecar.
Suchmodificationsdonotincludethesubstitutionorreplacementofanybodyworkorchassiscompo‐
nentexceptthosespecificallyauthorizedbytheserules.
O. The standard OE front spoiler or a non‐standard front spoiler may be used. If a non‐standard front
spoilerisuseditmustcomplywiththefollowingrequirements:Itshallnotprotrudebeyondtheoverall
outline of the car as viewed from above or aft of the forward‐most part of the front fender opening
(cutout) and shall not be mounted more than 4.0” (101.6 mm) above the horizontal centerline of the
frontwheelhubs.Thespoilershallnotcoverthenormalgrilleopeningatthefrontofthecar.Aninter‐
mediate mounting device may be used on cars whose front bodywork is above the 4.0” (101.6 mm)
minimum. Openings are permitted for the purpose of ducting air to the brakes, radiator, and/ or oil
cooler(s); equal openings may be placed in the standard lower front panel directly behind openings
placedinthespoiler.
P.Aspoilermaybeaddedtotherearofthecarprovideditcomplieswitheitherofthefollowing:
1.ItisaproductionrearspoilerwhichisstandardoroptionalequipmentofaUSmodelofthevehicleor
anexactreplicainanalternatematerial.
2. It isa non‐production rear spoiler which ismounted tothe rearportionof the rear hatch,deck,or
trunklid.Thespoilermayextendnomorethan10.0”(254.0mm)fromtheoriginalbodyworkinany
direction.Alternativelyinahatchback,thespoilermaybemountedtotherearhatchlidatornearthe
top of the hatch in such a configuration the spoiler may extend not more than 7½ inches (7.50”,
190.5mm)fromtheoriginalbodyworkinanydirection.Thespoilermaybenowiderthatthebody‐
work. The use of endplates is prohibited. Spoiler endplates are defined as any vertical (or
semi‐vertical)surfacesattachedinfrontofthespoilerwhichhavetheresultofcapturingandredis‐
tributingair(downforce)alongalloranyportionofthespoiler.Theangleofattackisfree.Thespoil‐
ermaynotfunctionasawing.
3.AllOErearwingsandrearspoilersmayberemoved.
4.VehiclesequippedwithanOErearwingmayaddarearspoileronlyiftheOEwingandwingattach‐
mentsarefirstremoved.
Q.Thefueltankmaybemodified,replaced,orrelocated.Ifthefueltankismodifiedorreplaced,thefol‐
lowingrestrictionsapply:
1.Nopartofthefueltankorfuelcellshallbecloserthan6.0”(152.4mm)tothegroundunlessenclosed
withinthebodyworkandmountedabovethefloorpan.Ametalbulkheadisrequiredthatprovides
total separation between the driver compartment and the compartment containing the fuel tank
and/orfiller/neck.Thisincludesfueltanksthatareflushmountedwithdrivercompartmentpanels
orotherwiseexposedtothedrivercompartment.Fuelfillerdoorsinthedrivercompartmentmustbe
positively fastened (non‐metallic fastenersare notallowed).For the purposesof these rules, afuel
tankconsistingofastructurecontainingafuelbladderisconsideredtobetheentirefuelcellinclud‐
ingthecontainingstructure.Thecontainingstructureofafuelcelldoesnotqualifyasabulkhead.A
separatemetalbulkheadmustisolatethefuelcellfromthepassengercompartment.
2.Internalbodypanelsmaybemodifiedtoaccommodatetheinstallationofthefueltankaslongassuch
modificationsservenootherpurpose.Intheeventinstallationincludesencroachmentintothedriv‐
er’scompartment,ametalbulkheadshallpreventexposureofthedrivertothefueltank.
3/19/2015
HC‐5
3.Fueltankbreathersshallnotventintothedriver/passengercompartment.
R.Allmirrorsandtheirassociatedmountinghardwaremayberemovedorreplaced.
S.Thehood,hatchback,decklid,andfendersmaybelightenedorreplacedbyonesofalternatematerial
provided the shape is similar to the original and does not confuse the identity of the vehicle. Factory
bolt‐on fenders may be replaced in their entirety. Cars with non‐removable fenders may replace the
front fender panels going forward from the foremost door opening and the rear fender panels going
rearwardfromthe rearmost dooropening. Closedcars must not removestandardmaterialabovethe
horizontallineplacedatthelowestpointofthedriver’sdoorwindowopening,withtheexceptionthat
OEremovablepanels(e.g.,T‐tops,targatops,sunroofs)mayberemovedorreplacedwithpanelsofal‐
ternatematerialprovidedthatthedimensionsofanyreplacementpaneldonotvaryfromthoseofthe
originalbymorethan1.0”(25.4mm)inanydirection.Theapprovalofalternatebodypanelsdoesnot
authorizetheuseofunderbodyorbellypansforwardofthefirewalloraftofthefrontedgeoftherear
wheel opening. Ground effect tunnels and/or attempts to gain ground effects are also not authorized.
Anysuchelementsincorporatedintheotherwiseapprovedcomponentsmustberemovedordisabled.
Fronthoodsandenginecoversmaybeventedand/orlouvered.Thetotalareaforallvents/louversona
vehiclemaynotexceed500sq.in.(3225.8cm²),unlessprovidedasstandardequipment.Thetotalarea
ismeasuredasthetotalopenareaortheperimeterofthelouverswhenviewedfromabove. Thelocation,number,andshapeofvents/louversisunrestrictedprovidedtheyarefullycontainedon
allowed panels. For vehicles having original vents/louvers exceeding these dimensions, no further
openingsarepermitted.Louveropeningsmustfacerearwardandmaystandnohigherthan1.0”(25.4
mm)abovetheoriginalsurface.Noadditionalscoops,cowls,bulges,orductsarepermittedunlessspec‐
ifiedinHCAppendix.
T.Allheadlights,frontparkinglights,andfrontsignallightsmayberemoved.Headlightdoorsmaybere‐
moved, replaced, or modified. Any remaining openings shall be covered with a wire mesh screen or
paneloffiberglass,Plexiglas®,metal,orothernonflammablematerial.Ductsfromheadlights,headlight
doors,frontparkinglights,andfrontsignallightsmaybeusedforductingairtotheengine,frontbrakes,
and/oroilcooler(s).Anyopeningusedforductingmaynotberelocated.Theseductsmaypassthrough
interiorpanelsforthispurpose.Thecrosssectionareaofasingleductshallnotexceedthecrosssec‐
tionalareaoftheoriginal(single)headlight.
U. All side marker lights and tail/stop lights may be removed. If such an item is removed, the resultant
openingmustbecovered.
V.Sparewheelandtiremayberemoved.
HC.3TIRES
Anytire(includingrecaps)meetingtheSolo®safetyrequirementsandtheapplicableportionsofSolo©
RulesSection3.3.3isallowed. HC.4WHEELS
A.Wheelspacersmaybeused.
B.Anywheelmountingstudorboltmaybeused.
C.Theuseofcenterlockwheelsandhubsispermitted.
D.Themanufacturer’soriginalwheelsizemaybeused;thisisaxle‐specificrelativetooriginal‐sizewheels.
TrackdimensionsmustcomplywiththosespecifiedintheHCAppendix,asapplicable.Anyweightin‐
creases listed here in Section HC.4 must be complied with. Original equipment size wheels exceeding
SectionHC.4.Aareallowedwithnoadditionalweightincreasebeyondthosespecified.
HC.5SHOCKABSORBERS&SPRINGS
A.Bumpstoprubbersandbracketrymayberemovedorreplacedwithothersofunrestrictedorigin.
B.Electricallycontrolledactiveshocksareprohibited.
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HC‐6
C.LEVEL1PREPARATION(FULLPREP)VEHICLES
1.Anyspringsortorsionbarsmaybeused.Springseatsandpointsofattachmentmaybereplacedor
altered.Adjustablespringperchesarepermitted.
2. Alternately, all cars may fit “coil‐over” type springs with tubular, load bearing shock absorbers or
struts.TheshockabsorberorMacPherson/Chapmanstrutshallbeinstalledinsidethespring.Such
itemsshallnotexceedoneshock/strutperwheel.Whenloadbearingshocksareused,theoriginal
springsmayberemoved.
3.Anyshockabsorbersmaybeused.Thetotalnumberofshockabsorbersinstalledshallnotexceedthe
numberoriginallyinstalledbythemanufacturer.
4.Attachmentpointsfortheshockabsorbersmaybechanged.Thereshallbeametalpanel,covering,or
bulkheadseparatingnon‐standardrearattachmentpointsfromthedriver.
5.Levershockabsorbersmaybemodifiedorentirelyeliminated.Whenlevershocksarereplacedwith
tubular shocks, the entire shock assembly may be removed and replaced with a control link and
bracketthatapproximatesthecontrolfunctionoftheoriginallevershock.
6. Rockerarmsandpush‐pullrodsmaybeused.Thereshallbeametalpanelorbulkheadseparating
non‐standardcomponentsfromthedriver.
EVEL
2PREPARATION(LIMITEDPREP)VEHICLES
D. L
1. Any springs or torsion bars can be used provided the quantity and type of these items remains as
standard.Springsandtorsionbarsmustbeinstalledinthestandardlocationusingthestandardsys‐
temofattachment.Theuseoftenderspringsispermittedprovidedthetenderspringsarecompletely
compressedwhenthecarisatstaticrideheight.Staticrideheightwillbedeterminedwiththedriver
seatedinthenormaldrivingposition.
2.Shockabsorbersareunrestrictedprovidedthequantityandtype(i.e.,tube,lever)oftheseitemsre‐
mainsasfittedstandard.Shockabsorbersmustbeinstalledinthestandardlocationusingthestand‐
ardsystemofattachment.Themountingoftheremotereservoirofaremotereservoirshockabsorb‐
erisunrestricted.Noshockabsorbercanbecapableofadjustmentbythedriverwhilethecarisin
motion,unlessfittedasstandard.
HC.6BRAKES
Brake systems, including calipers, caliper mounts, disks, drums, lines, backing plates, pedals, boosters,
master cylinders, handles, proportioning devices, pads, linings, etc. are unrestricted except for Section
3.3.3oftheSolo©Rulesrequirementsandasfollows:
A.Brakerotors/drumsshallbelocatedintheoriginalposition(i.e.,inboardvs.outboard).
B. Brake rotor/drum friction surfaces must be ferrous metal. Carbon or ceramic composite brake ro‐
tors/drumsareexpresslyprohibited.
C.Addition,replacement,ormodificationofAnti‐lockBrakingSystems(ABS)isprohibited.Thestandard
systemmayberemovedinitsentiretyordisabledelectricallyinamannernotreadilyaccessiblewhile
driving,butnotalteredinanyotherway.SensorsandcomputersareconsideredpartoftheABSsystem
andmaybenotalterednorrelocated.
D.LEVEL2PREPARATION(LIMITEDPREP)VEHICLES
1.Standardcalipersmustberetained.Alternatebrakerotorsanddrumsmustbethestandarddiameter,
width,anddesign.RotorsshallnotbecrossdrilledorslottedunlessfittedasOE.
2.Carsfittedwithreardrumbrakesmayconverttoreardiscbrakes.Whenconvertingfromreardrum
to rear disc brakes, the rear brake rotors can be no larger in diameter than the largest permitted
frontbrakerotors.
HC.7ANTI‐ROLL(SWAY)BARS
Any anti‐roll bar is permitted. Attachment points are unrestricted. Components may pass through body
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HC‐7
panels,chassispanels,andframemembers. A. LEVEL 1 PREPARATION (FULL PREP) VEHICLES: Components may extend into the driver/passenger/trunk
compartments,butshallbecoveredwithmetalpanels.
B. LEVEL 2 PREPARATION (LIMITED PREP) VEHICLES: Components and mounting cannot be located in the driv‐
er/passenger/trunkcompartmentunlessfittedasstandard.
HC.8SUSPENSION/SUSPENSIONCONTROL
A.Spindles,hubs,bearings,bearingcarriers,stubaxles,etc.maybemodifiedorreplaced.
B.SuspensionControl
1.Originalsuspensioncontrolarmsmaybereinforced,modified,orreplacedwithcomponentsofunre‐
strictedorigin.
2. The manufacturer’s original basic type of rear suspension (e.g., independent, live axle, swing axle,
MacPhersonstrut,A‐arm,etc.)shallberetainedunlessotherwisestatedintheHCAppendix.
3.Suspensionbushingsareunrestricted.Adjustablesphericalbearingsorrodendsarepermittedonall
suspensioncomponents.
4.Thewheelbaseofthevehicleshallnotbechangedorrelocatedinafore/aftdirectionbymorethan
±1.0”(±25.4mm).
5.TheminimumtrackistheOEtrackdimension.(NOTE:ThisminimumappliestocarsutilizingSection
HC.11.A.)
6. LEVEL1PREPARATION(FULLPREP)VEHICLES
a.Suspensionpick‐uppointsonthechassisorstructuremayberelocated.Ifsuchpointsarerelocat‐
ed,thereshallbeametalpanel,covering,orbulkheadseparatingthedriver/passengerareafrom
thesuspensioncomponents.
b.Front:VehiclesoriginallyequippedwithMacPhersonstrutfrontsuspensionmayconverttodouble
A‐arm. Other vehicles must retain the manufacturer’s system of front suspension. A‐arm front
suspension shall have the shocks attached outboard of the inner pickup point on the upper or
lowercontrolarm.Rockerarms,push‐pullrods,etc.,areprohibitedunlessotherwisestatedinthe
HCAppendix.
c.Rear:Additionorreplacementofsuspensionstabilizers(linkagesconnectingtheaxletothebody
orframe)forlateraland/orfore/aftsuspensioncontrolarepermitted(e.g.,panhardrods,watts
links, torque arms, traction arms/bars, camber‐compensators). There shall be a metal panel or
bulkheadseparatingnon‐standardcomponentsfromthedriver.
7.LEVEL2PREPARATION(LIMITEDPREP)VEHICLES
a.Suspensionpick‐uppointsonthechassisorsubframestructuremaynotberelocated.Allowedal‐
ternate bushings/bearings must contain the pivot point within the space occupied by the OE
bushing.
b. Vehicles equipped with MacPherson/Chapman struts may slot the mounting holes or add addi‐
tionaladjustmentplatesprovidedthatthecenterholeisnotenlargedorrelocated.Thestrutshaft
mustpassthroughthecenterhole.Mountingofadjustmentplatesisunrestricted.
c.Camberandcastermaybeadjustedbymodificationorreplacementofexistingbracketswhichlo‐
catecontrolpivotsandbolttothechassisorsubframestructure.Anyresultingchangeinthever‐
ticalpositionofthepivotpointsmustremainwithin1.0”(25.4mm)oftheoriginallocation.
C.Steering
1. Steering arms, pitman arms, steering racks/gears, and steering linkage component parts may be
modified, reinforced, or substituted. Power‐assist steering components may be added, removed, or
modified.Thesteeringsystemmayberelocatedorchanged.
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HC‐8
2. The steering column is unrestricted. A collapsible‐type steering column having a layout and design
and/or a column structure with impact and energy absorbing characteristics is strongly recom‐
mended.
3.Anysteeringwheelandwheelquick‐releasemechanismmaybeused.Steeringwheelrakeandsteer‐
ingcolumnlengthmaybealtered.Steeringquickenersmaybeaddedtothesteeringcolumn.
D.Allsphericalrodendsusedonmajorsuspensionandsteeringcomponentsshallberetainedeitherby
thedesignofthemountingbrackets,alargerareacaptivewasher,ortheinherentmechanicaldesignof
theunit.
HC.9ELECTRICALSYSTEM
A.Theuseofanydriveroperatedelectricstarterispermitted.
B. The use of any ignition system (except magneto ignition) is permitted provided the number of spark
plugsremainsthesameasthatofthestandardproductionengine.Ifadistributorisremoved,ablanking
plateorbreathermaybefittedinitsplace.
C. The original generator or alternator may be completely removed or replaced. Mounting location and
drivesystemforthegeneratororalternatorisunrestricted.
D.Theremainingcomponentsoftheelectricalsystemareunrestricted.
E.Itisrecommendedthatallvehiclesbeequippedwithanelectricalsystemmastercutoffswitch.
HC.10ENGINEANDDRIVETRAIN
A. ComponentModification
1. Where allowed, original and alternate components of the engine may be lightened, balanced, and
modified by any mechanical or chemical means, provided that it is always possible to identify re‐
quiredcomponentsasoriginal.Suchmeansinclude,butarenotlimitedto,shotpeening,glassbead‐
ing,heattreatmentorhardening,plating,andmilling.
2.Nomaterialormechanicalextensionmaybeaddedtoanyrequiredoriginalcomponentunlessspe‐
cifically authorized by these rules. Any repair performed to a required original component shall
clearly serve no other prohibited function. Compression ratio may not be increased via welding of
combustionchambers.
B. InductionSystem
1.Anyairfilter(s),velocitystack(s)andorairbox(es)maybefitted.Airmaybeductedtothecarburetor
orfuelinjectionprovidedthattheductingiscontainedwithintheenginecompartmentandthatthe
air to be ducted is supplied through normal or specifically authorized openings in the bodywork.
Headlight,frontparkinglight,frontsignallight,andsimilarstandardopeningsinthefrontofthecar
maybeusedforductingairtotheengineandductsmaypassthroughinteriorpanelsforthispur‐
pose.“Standardopeningsinthefrontofthecar”includesventilationsystemintakegrilles.
2.Anythrottlelinkagemaybeused.Allthrottlelinkagesshallbeequippedwithmorethanonesystem
ofpositivethrottleclosure.Anythrottlepedalmaybeused.
3.Allinductedair,withtheexceptionofidleair,shallpassthroughthethrottleventuri(s).
4.LEVEL1PREPARATION(FULLPREP)VEHICLES
Intakemanifoldsareunrestrictedexceptthatnoportionofanyintakemanifoldmayextendintothe
intakeportsofthecylinderheadorrotaryengineendplate.
5.LEVEL2PREPARATION(LIMITEDPREP)VEHICLES
a.Allinductedairmustpassthroughthethrottlebodyandbesubjecttocontrolbythethrottlebut‐
terfly.Allsingle‐carburetedcarsmayfitapermittedoptionalcarburetorpertheHCAppendix.The
standardorpermittedalternatecarburetormustnotbemodified.Carburetorjetsneedles,meter‐
ingrodsandneedlevalvesareunrestricted.Chokemechanisms,plates,rods,andactuatingcables,
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HC‐9
wires,orhosescanberemoved.ThenumberofcarburetorsmustnotbechangedfromOE.
b.Standardorpermittedalternatecarburetor(s)canuseanadaptorplateand/oraspacerinaddition
toanystandardspacerbetweenthecarburetor(s)andtheintakemanifold.Materialfortheadap‐
torplateandspacerisunrestricted.Noadaptorplateorspacercanserveanypurposeotherthan
to space out and/or mate the carburetor(s) to the permitted intake manifold. The adapter or
spacercannotcreateaplenumorchangethecarburetororientation.Themaximumthicknessfor
theadapter,spacer,standardspacer,orcombinationofallis1¼inches(1.250”,31.75mm).For
thepurposeoftheserulesanisolatorisaspacer.
c.FuelInjection:Thestandardthrottlebodymustberetainedandmaynotbemodified.Thenumber
ofinjectorsmustremainstandard.Themountingpositionandinjectionpointmustbestandard.In
allotherrespectsthefuelinjectionsystemisunrestricted.
d.Theintakemanifoldmaybeportmatchedontheportmatingsurfacetoadepthofnomorethan
1.0”(25.4mm).Balancepipesortubesonallintakemanifoldscanbepluggedorrestricted.The
intakemanifoldcannototherwisebemodified.
C. InductionSystem‐Turbocharged/SuperchargedEngines
Turbochargingandsuperchargingisprohibited. D. FuelSystem
1.Anyfuelline(s)maybeused.Allnon‐standardfuelline(s)passingthroughthepassengercompart‐
ment shall be made of metal or metal‐braided hose or equivalent (e.g., Nomex, Kevlar, or ny‐
lon‐braidedhose)withANSeriesthreadedcouplingsorentirelycoveredandprotectedwithametal
cover.
2.Anyfuelpump(s),filter(s),andpressureregulator(s)maybeused.Suchcomponentsmaynotbelo‐
catedinthepassengercompartmentbuttheirlocationwithinthebodyworkofthecarisotherwise
unrestricted. If a mechanical pump is replaced, a blanking plate may be used to cover the original
mountingpoint.
3.Acool‐can,notexceedingonegalloninvolume,maybeused.Thecool‐canmaynotbeinstalledinthe
passengercompartment.
E. Allemissionequipmentmayberemoved,inpartorinwhole.Removalistheonlypermittedmodifica‐
tion to emission control equipment. When EGR air nozzles are removed from a cylinder head, the re‐
sultantholesshallbecompletelyplugged.
F. CylinderHead
1.Theoriginaloraspecifiedalternatecylinderheadshallbeused. 2. Compression ratio may be altered by machining, using any head gasket(s), or elimination of head
gasket(s).
3.LEVEL1PREPARATION(FULLPREP)VEHICLES
a.Anyvalveguidesandvalveseatsmaybeused.
b. HeadsmaybemodifiedperSectionHC.10.A.1.
4.LEVEL2PREPARATION(LIMITEDPREP)VEHICLES
a.Headsmaybeportedwithin1.0”(25.4mm)ofthemanifoldmountingsurface.
b.Fuelinjectorportsmustbepluggedifcarburetorsareused.
c.MachiningisallowedtoaccommodatetheinstallationofO‐ringstoreplaceorsupplementacylin‐
derheadgasket.
d. Valve seats are unrestricted. Valve seat angles are unrestricted. The valve seat insert can be no
tallerthan½inch(0.50”,12.7mm).
e.Valveguidematerialisunrestricted,butmusthavestandardexternaldimensions.
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HC‐10
G. CamshaftandValveGear
1.Camtimingchains,gears,belts,sprockets,andassociatedcoversareunrestricted.
2. A timing chain/belt tensioner may be added to those engines not originally so equipped, provided
that it acts upon that portion of the chain/belt that travels from the crank drive to the first cam
sprocket/gear. The timing chain cover may be modified to facilitate its use. Adjustable cam timing
sprocketsarepermitted.
3.Anymetalvalvesmaybeused.Valvesprings,valveretainers,keepers,seals,andadjustingshimsare
unrestricted.
4.Pushrodsareunrestrictedexcepttheymustbemadeofmetal.
5.Anycamfollowersmaybeused.
6.Anyvalvecoversmaybeused.
7.LEVEL1PREPARATION(FULLPREP)VEHICLES
a.Anycamshaft(s)maybeused.
b.Valvesizesareunrestricted.
c.Valvetrainrockerarms,shafts,andattendantassemblies(suchasrockerstudgirdles)areunre‐
stricted.
EVEL
2PREPARATION(LIMITEDPREP)VEHICLES
8.L
a. Camshafts are unrestricted except for limits as described in the HC Appendix. Where maximum
valveliftisspecified,valveliftismeasuredatthevalvewithzerolashorclearance.
b.ValvesizesaretoremainstandardunlessspecificallyallowedintheHCAppendix.
c.Rockershafts,whenutilizedinthesamestandardsystem,canbereplacedbyanalternateshafts
and are unrestricted. Valve train rocker arms, cam followers, rocker ratios, and rocker/follower
ratiosmustbestandard.
H.Block
1.Theblockmaybereborednomorethan0.0472”(1.2mm)overstandard.US‐producedsix‐cylinder
andeight‐cylinderenginesmaybereborednomorethan0.060”(1.52mm)overstandard.Alternate
blockswhichareofthesamematerialandnominaldimensionsasstandardareallowed.Criticaldi‐
mensionsforpistonenginesaredeckheight,cylinderbore,cylinderspacing,veeangle,anddistance
fromcrankcenterlinetocamcenterline. 2.Cylindersleevesmaybefittedtotheblockforrepairpurposesiftheyservenootherprohibitedfunc‐
tion. Sleeving may not be used to create a new engine configuration (one which exhibits the same
displacementasanallowedengine,butwhichhasdifferingboreandstroke),unlessauthorizedinthe
HCAppendix.Oilpassagesmaybeenlarged,restricted,orplugged.
3.Anycrankshaftmainbearingcapsandanyadditionalmainbearingcapboltsmaybeusedprovided
thatnomaterialisaddedtotheblockfortheiruse.Anycrankshaftmainbearingstudgirdlemaybe
used.
4. The compression ratio may be increased by means of milling the block and the block may be ma‐
chinedtoutilizeO‐ringstoreplaceorsupplementacylinderheadgasket.
5.Theblockmaybemachinedforthepurposeofaddingorsubstitutingcrankshaftoilseal(s)andrelat‐
edattachmentdevices.
I. PistonsandRods
1.Pistons,pins,clipsand/orpinretainers,andpistonringsareunrestricted.Pistonsshallbeconstruct‐
edofmetal.
2. LEVEL 1 PREPARATION (FULL PREP) VEHICLES: Alternate connecting rods made of ferrous material are
permitted.
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HC‐11
3.LEVEL2PREPARATION(LIMITEDPREP)VEHICLES
a.Standardconnectingrodsarerequiredbutcanbelightenedandbalanced.
b.Connectingrodfasteners(boltsandnuts)areunrestricted.
J. CrankandFlywheel
1.Theoriginaldirectionofcrankshaftrotationandfiringordershallbemaintained.
2.Theuseofanyexternalcrankshaftvibrationdampenerispermitted.
3. The linkage between the clutch pedal and the clutch housing/clutch actuating mechanism is unre‐
stricted, but may serve no other purpose. A mechanical linkage may be replaced with a hydraulic
system.Anyclutchpedalmaybeused.
4.LEVEL1PREPARATION(FULLPREP)VEHICLES
a.Thecrankshaftmaybereplacedwithanotherofthesamebasicmaterialprovidedtheanglesofthe
crankthrowsremainthesame.NochangeinstrokeispermittedunlessauthorizedintheHCAp‐
pendix.
b.Anyclutchispermitted. c.Anysteeloraluminumflywheelispermitted.
5. LEVEL2PREPARATION(LIMITEDPREP)VEHICLES
a. Standardcrankshaftsarerequired.Thecrankshaftmaybelightenedandbalanced.Journaldiame‐
terscanbeamaximumundersizeof0.045”(1.14mm)fromstandarddiameter.
b.Anyflywheelofstandarddiameterorlargermaybeusedprovideditattachestothestandardor
permitted alternate crankshaft at the standard location. Additional fasteners may be used. The
diameteroftheflywheelincludesthediameterofthestarterringgear.Carsthatarepermitteda
specificalternatetransmissiononthespecificationlinemayuseaflywheelofstandarddiameter
orlargerforthatalternatetransmission.
c. Clutch assemblies, clutch linkages, and release bearings are unrestricted. Carbon clutch compo‐
nentsareprohibited.
K. OilingSystem
1. The use of any oil pan/sump, scrapers, baffles, windage trays, oil pickup(s), pressure accumulator
(Accusump®),andoilfilter(s)ispermitted.Filterandaccumulatorlocationisunrestrictedbutthey
shallbesecurelymountedwithinthebodywork.
2.Theinstallationofanytypeofventorbreatherontheengineispermitted.Crankcase,oilingsystem,
breather,orcatchtankevacuationsystemsthatareinanywayconnectedtotheexhaustsystemare
prohibited.
3. LEVEL 1 PREPARATION (FULL PREP) VEHICLES: Any engine driven oil pump may be used including a dry
sumpsystem.Thedrysumptankshallbemountedwithinthebodywork.Ifsaidtankismountedin
thedriver/passengercompartment,itshallbeisolatedfromthedriverbymeansofametalbulkhead
oradditionalcontainerthatretainsanyspillageorleakage.
4.LEVEL2PREPARATION(LIMITEDPREP)VEHICLES:Any mechanically driven oil pump can be used. Chassis
componentsmaybemodifiedtoallowinstallationoftheoilpump.Drysumpsystemsareprohibited.
L. Thecomponentsoftheexhaustsystemareunrestricted.ExhaustmustbecompliantwithSection3.3.3
of the Solo© Rules and may exit through the bodywork. Rocker panels may be modified for exhaust
routing.
M.OtherEngineComponents
1.Theuseofalternateenginecomponentswhicharenormallyexpendableandconsideredreplacement
parts,suchasseals,bearings,waterpumps,etc.,ispermitted.Fastenersmaybesubstituted.
2.Bushingsmaybeinstalledwherenonearefittedasstandardprovidedtheyareconcentricandthat
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HC‐12
the centerline of the bushed part is not changed. The addition of alignment dowels is permitted.
Bushings are required to be concentric so that unintended relocations and realignments are not
permitted.
3.Gasketsmaybereplacedwithothersofunrestrictedorigin.
4. Alternator/generator, crankshaft, and water pump pulleys may be altered or replaced by others of
unrestrictedorigin.
5.Oneormoreenginetorquesuppressorsmaybefitted.Originaltorquesuppressorsmaybealtered,
replaced,orremoved.
6.Motormountsofalternatedesignand/ormaterialmaybeused.
7.Theenginemaynotberelocated.
N.CoolingSystem
1.Coolingfan(s)maybemodified,substituted,orremoved.Electricallyoperatedcoolingfan(s)maybe
installedprovidedit(they)servenootherpurpose.Theuseofanyengine,transmission,and/ordif‐
ferentialoilcooler(s)is/arepermittedprovidedit/theyis/aremountedcompletelywithinorunder
thebodywork,butnotinthedriver/passengercompartment.Associatedoilcoolerpumpsandlines
arepermittedforthetransmissionanddifferential.Airductsmaybefittedtotheoilcooler(s)asspe‐
cificallyauthorizedherein.
2.Anywaterradiatorisallowed,providedtherearenochangesintheexteriorbodyworktoaccommo‐
date its use. It shall not be located in the driver/ passenger compartment. Separate expansion or
headertank(s)arepermittedprovidedtheyarenotmountedinthedriver/passengercompartment.
Theheatercoremayberemovedentirelybutnotmodifiedorreplaced.Waterradiatorsmaybefilled
withwater,antifreeze,and/ornonflammableliquidsthepurposeofwhichistotransferheatand/or
inhibitfreezing,boiling,and/orcorrosion.Othermodificationswhichmaybeinvolvedinitsuseare
notpermittedunlessexplicitlyallowedbythecontentsoftheserules.Aradiatormayberelocatedso
longastheotherapplicablerulesarenotviolated(e.g.,theexteriorbodyworkisnotaltered)toac‐
commodatethechange.
3. Sealing or shrouding the airflow area between the normal grill opening and the water radiator is
permitted.
4.Onwater‐cooledcars,thermostatsmayberemoved,modified,orreplacedwithblankingsleevesor
restrictors.
5.Thedirectionofwaterflowthroughtheengineshallnotbechangedfromthatwhichwasoriginalfor
theengineunlessauthorizedintheHCAppendix.
6.Electricallydrivenwaterpumpsareallowed.Alternatemechanicalwaterpumpsarenotrequiredto
beofthesameconfigurationastheoriginal.Electricwaterpumpsmayberelocated.
O. Transmission
1.Thestandardtransmissionwithoutmodificationmaybeused.
2.Anymechanicalshiftlinkageormechanismforchanginggearsmaybeusedincludinguseoflockout
mechanisms.Theshiftleveropeninginthebodyofthecarmaybealteredtoallowtheinstallationof
analternateshiftlinkage.
3.LEVEL1PREPARATION(FULLPREP)VEHICLES
a. Any non‐sequential manual transmission is allowed. Any automatic sequential transmission em‐
ployingatorqueconverterisallowed.
b. Hydraulic/electric shifting mechanisms may be modified in automatic sequential transmissions
employingatorqueconverter.
c. Pneumatic, hydraulic, or electronically‐controlled shifting is not allowed for manual transmis‐
sions, except for electronically‐controlled overdrive manual transmissions in cars which were
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HC‐13
originallyequippedwiththem.
d.Gearratiosmaybemodified.
e.Afunctionalreversegearisnotrequired.
f.Thetransmissiontunnel/covermaybealteredtoallowtheinstallationofanalternatetransmission
and/or driveshaft. Cars originally equipped with a removable transmission tunnel/cover may
substituteatunnel/coverofanalternatematerial.
4.LEVEL2PREPARATION(LIMITEDPREP)VEHICLES
a.Thereisnoweightincreasefortheuseofastandardtransmissionutilizingstandardcase,gearra‐
tios,andsynchromeshstylegearengagement.
b. An alternate transmission that uses standard‐type, circular, beveled synchronizers, imposes a
2.5%weightincrease.
c. An alternate transmission that uses a gear engagement mechanism different than standard‐type,
circular,beveledsynchronizersimposesa5%weightincrease.
P. FinalDrive
1. Alternatedriveshaft(s)maybeused.Anydriveshaftassemblymaybemodifiedtopermittheuseof
analternatetransmission.Allnon‐standarddriveshaftsmustbemadeofmetal.
2.Anygearratioand/ordifferential(limitedsliporlocked)ispermitted.Finaldriveunitswhichpermit
gearratiochangeswhilethecarisinmotionareprohibited.
3.Anydriveaxleshafts,bearings,bearingcarriers,hubs,anduniversal/CVjointsmaybeused.
4. “Loops” may be installed to prevent the driveshaft from contacting the ground in the event of
driveshaftand/orU‐jointfailure.
5.LEVEL1PREPARATION(FULLPREP)VEHICLES:Anyaxletubeorfinaldrivehousingispermitted.
6.LEVEL2PREPARATION(LIMITEDPREP)VEHICLES:Substitutionofthedifferentialhousingisonlypermitted
onfront‐engine/front‐driveorrear‐engine/rear‐drivecarsthroughtheuseofanalternatetransaxle.
Q. Allenginecrankcaseandradiatoroverflow/breatherlinesshallterminateincontainersofatleast1qt.
(0.95L)capacity.Thesecontainerscannotbeventedintothedriver/passengercompartment.
HC.11OTHER
A. HCvehiclespreparedinexcessoftheseallowancesandprepareduptoeitherthecurrentClubRacing
GT or Production Category rules are permitted to compete. Section HC.8.B.7 minimum track require‐
ments apply. Minimum weight will be 110% of the minimum weight from the HC Appendix plus any
weight additions (wheel size weight increases, etc.). Vehicles taking advantage of this allowance may
usetheHCpreparationrulesortheSCCA©ClubRacingGCR(GeneralCompetitionRules)allowancesin
whole,inpart,orincombination.CarswhicharenotlistedintheGCRmaynotusethisallowanceand
arelimitedtothemodificationsallowedintheserules.Forthosecarswhichhavebeende‐listedfrom
thecurrentyearGCR,theappropriatespecificationswillbedevelopedandaddedtotheHCAppendix
upon member request. An exception to the GCR will be that open cars are permitted provided they
complywithallprovisionsoftheserules.ThefollowingitemslistedintheGCR,whilerecommended,are
notrequired:Logbooks,annualinspections,rollcage,on‐boardfiresystems,hand‐heldfireextinguish‐
er, scattershield/chain guards, master switch, steering wheel lock removal, window safety net, wind‐
shieldsafetyclipsandrearwindowsafetystraps,andbraidedsteelbrakelines.SingleInletRestrictors
(SIRs)arenotrequired.DuetotheextentofmodificationspermittedonGT‐derivedcarsclassedwithin
the HC Prepared class, it is possible for a replica car to meet the legality requirements for the corre‐
sponding original model provided that the engine, track, and wheelbase remain within the allowed
specifications.InsuchacasethereplicaisconsideredlegalforPrepared,provideditcorrectlymeetsall
oftheapplicableGCRspecifications.The10%increaseinminimumweightdoesapplytosuchcars.
B.WeightCalculations
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HC‐14
Wherethereisapercentageadditionaswellasaspecificweightaddition,thepercentageisaddedto
thebaseweightbeforethespecificweightaddition.
C.Dataacquisition/recordingsystemsarepermitted.
D.Exceptwheretherearespecificrequirementsintheserules,anysafelineforfuel,hydraulicfluids,oil,
waterorbreatherisallowed.
E.Ballastmaybeaddedtoallcarsasrequiredtomeetminimumweightprovideditissecurelymounted
withinthebodyworkandservesnootherpurpose.Ballastplatesmaybeinstalledbeneaththefloorpan
solongastheydonotprotrudebeyonditsedges.
F.Allcarsmayhavetowingeyes,hooks,orstrapswhichdonotdangerouslyprotrudefromthebodywork.
G. Removal of or modification to heating, ventilation, air conditioning, wiper/washer, audio, security,
communication,andconveniencesystemsisallowedprovidedthemodificationdoesnotserveanother
purpose(e.g.,anairconditioningcompressormaynotbemodifiedtoserveasasupercharger).
HC.12SAFETY
A.RollBars/RollCages(Aluminumisnotanallowedmaterial.)
1. All open HC vehicles shall have at a minimum a roll bar complying with Appendix C of the Solo©
Rules.
2.ItisrecommendedthatallcarsbeequippedwitharollcagemeetingtherequirementsoftheSCCA©
Club Racing GCR. Compliance with this requirement supersedes the need to comply with Section
HC.12.A.1.
3.Rollbarsandcagesmayeitherbeboltedorweldedtothevehicle.
B. AtaminimumallvehicleswillbeequippedwithdriverrestraintsmeetingSolo®safetyrequirements.It
ishighlyrecommendedthatallcarswithrollbars/cagesbeequippedwithdriverrestraintsmeetingthe
requirementsoftheGCR.
C. Ascattershieldorexplosion‐proofbellhousingcomplyingwiththeGCRisrecommended.
D.Fireextinguishersorfiresystemsarepermitted.
HC.13GCR‐compliantFormulaVee
1. SCCA© GCR‐compliant Formula Veevehicles are permitted to compete in the Heritage Classic Pre‐
paredclass.
2. SectionsHC.0.AandHC.0.Bdonotapply.
3. AllrulespertainingtoauthorizedmodificationsshallbecontainedinthecurrentGCR.
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