ChevroletPerformanceStock
CLASSOVERVIEW
CPStockisanaturallyaspiratedheads-upclassdesignedfor1955andnewerGM(General
Motors)bodiedvehiclesandisdesignedasalowcost,entrylevelheads-upclass.CPStockis
designedaroundcompetitorsusingaproductionOEMSealedChevroletPerformanceDR525
crateenginecombinedwithafactoryChevroletPerformancesealedECMandinstallationkit.
Thishelpscontroltheeverrisingexpensesassociatedwithcompetitiveheads-updragracing
andallowsracerstoexploreotheravenuestogainaperformanceadvantage.Allentriesmust
competeonacceptedsuspensionandatthesamebaseweight.
CONTRACT
Allentriesarerequiredtoreadandsignaracer’scontract.Thepurposeofthiscontractisto
keepclassparticipantsfromtamperingwithand/oralteringtheOEMSealedChevrolet
PerformanceDR525crateenginealongwiththesuppliedtune.Anybreachinthiscontractwill
resultinsuspensionfromNMCAcompetitionforallrelatedparties.Severityofasuspension
willbedeterminedbytheNMCAEventDirectorandTechDirector,basedontheseverityof
eachinfraction.
Note:Thissetofclassrulesispresentedtoallcompetitorsundertheassumptionthatany
modificationsnotspecificallywrittenwithintheserulesshallbedeemedillegal,unlessthe
competitorhastheexpressedwrittenconsentfromtheNMCATechDirector.
RACINGFORMAT
Thisclasswillbeanallrunheads-upfield,NHRAProLadder,Autostart,.400ProTree.
ENGINEMAXCIDBASEWEIGHT
ChevroletPerformanceDR525
3200lbs
Note:Allweightsarewithdriverandroundeddowntothenearestfivepoundincrement.
REQUIREMENTS&SPECIFICATIONS
ENGINE:1
ENGINE
OEMSealedChevroletPerformanceDR525ismandatoryforallentries.Anyinternalorexternal
enginemodifications(includingsensors:crank,cam,O2,etc…)arestrictlyprohibited.
Remanufacturedenginesareprohibited.
ChevroletPerformanceSealedEngineTechnologyproducestheDR525hasauniquely
identifiableenginesealateachofthefollowinglocations:
2sealsontheintakemanifold
1sealonthefrontcover
1sealontheoilpan
Rollie Miller 3/17/2016 1:43 PM
Deleted: 3300
(Belowaretheonly2approvedenginekitpartnumbers,whichincludetheengineand
instructionsheets)
ChevroletPerformancePart#19329008(DR525crateenginewithF-caroilPanenginekit)
ChevroletPerformancePart#19329009(DR525crateenginewithmusclecaroilPanenginekit)
BLOCK
(Belowaretheonly2approvedblockpart#s)
ChevroletPerformanceBlockPart#12623967
ChevroletPerformanceBlockPart#12629017.
HARMONICBALANCER
SFIapprovedharmonicbalancerwithaminimumdiameterof(7.33)inchesisrequired.
Diameterwillbemeasuredfromthetopoftheserpentinebeltribslocatedonthebalancer.
ENGINEMOUNTS&LOCATION
Solidenginemountsarepermitted.Engine/Motorplatesareprohibited.Engineblockand
cylinderheadscannotbeincontactwiththefirewall.
INTAKEMANIFOLD
StockChevroletPerformanceOEMsuppliedintakemanifoldistheonlyintakepermittedforall
entries.
ENGINEDRIVEBELTSYSTEM
UnmodifiedOEM6-ribserpentinebeltdrivesystemrequired.
OILINGSYSTEM
ChevroletPerformanceOEMsuppliedunmodifiedoilingsystemandoilpanrequired.Any
externaloilpumps,oillinesvacuumpump/crankcaseventilationsystem,oranyotheroil
systemadd-onisprohibited.OEMrecommendedOilAccumulatorsarepermitted
COOLINGSYSTEM
RadiatorandChevroletPerformanceOEMsuppliedwaterpumpisrequired.Waterpumpmust
beunmodified.AnyOEMorproductionstyleradiatorispermittedandmustmountinthestock
location.Anycoolingfanspermitted.StockChevroletPerformanceOEMcoresupportis
required.
EXHAUSTSYSTEM
Aftermarketlongtubestyleheadersarepermittedwithamaximumoutsidediameterprimary
tubesizeof1.930inches.Completeexhaustsystemwithtwomufflersisrequired.Maximum
exhausttubingdiameteris4inchesandmustexitwithin12inchesoftherearaxlecenterline.
FUELSYSTEM
ChevroletPerformanceFilter/pressureregulatorPart#19239926isrecommended.
Aftermarketfuelpumpsalongwithoneaftermarketfuelpressureregulatorpermitted.
Maximumfuelpressuremeasuredattheregulatoris65psi.Allfuellinesmustoriginateand
returntoonefuelcell.Anymethodofartificiallycoolingfuelisprohibited.Acheckvalve
mountedbetweenpressureregulatorandfuelrailsforfuelremovalismandatory.Allentries
willbesubjectedtorandomfuelchecks.Fuelcellsarepermittedandmustbelocatedinthe
trunkarea.
EFISYSTEM
ChevroletPerformanceRacingPerformanceProductssealedengineControllerPartNumber#
19329004ismandatoryandtheonlyapprovedprocessorthroughJune15,2016.
ThenewSealedEngineControllerPartNumber#19353299willbepermittedbeggingJune15,
2016andwillbetheonlyControllerpermittedafterJanurary1,2017.
ThetwoControllers(#19329004and#19353299),willbothbepermittedfromJune15,2016to
January1,2017.
Processormustremainintact,unmodifiedandmustbefunctional.Anycomputer‘’add-ons’’are
prohibited.EntriesarerequiredtorunthespectuneprovidedbyChevroletPerformanceorthe
NMCA.
Allentrieswillbesubjectedtorandomprocessorrecalibrationsand/orexchangestoensurea
levelplayingfield.AnOEMsuppliedstockthrottlebodymountedinthestocklocationis
required.Maximumthrottlebodysizeis90mm.
Anymodificationsperformedtothethrottlebodyareprohibited.Theuseofaftermarket
throttlebodiesisprohibited.
Massairsensormustbenocloserthan4inchestothethrottlebodytothesensorandno
furtherthan12inchesawayfromthethrottlebodytothesensor.Aftermarketmassair
housingpermitted.Massairsensorisrequiredtobefunctional.
EightunmodifiedOEMsuppliedfuelinjectorsaremandatory.Fuelinjectorsmustremaininthe
stocklocation.Aftermarketfuelrailsareprohibited.
PCVsystemmustbeinstalledpertheChevroletPerformancecontrollerinstructions.
AIRFILTERSYSTEM
Anyautomotivetypeaftermarketairfiltersystemrequired.RecommendaDryMediaTypeair
filter.Allincomingairenteringtheenginemustpassthroughanairfiltersystem.
FUEL
VPRacingFuelsC-10gasolineistheonlyfuelpermitted.Entrieswillbesubjectedtorandom
checkstoverifylegalityoffuelbeingused.Failuretopassfuelcheckwillresultindisallowance
ofarunduringqualifyingorbeingdisqualifiedduringeliminations.SeetheSpecFuelchartin
GeneralRegulationsD.7.
DRIVETRAIN:2
AUTOMATICTRANSMISSION
AnyGM,NONECM/PCM“COMPUTER”controlledautomatictransmissionpermitted.
PermittedtransmissionsincludeTH200,350,400,powerglide.
Automatictransmissionconvertersmustbeweld-uptypeandhavesteelcasehousing.
Trans-brakesarepermitted.
Pneumatic,electric,hydraulic,etc.shiftersareprohibited.
DRIVELINE
Anysteeloraluminumdriveshaftisrequired.Carbonfiberdriveshaftisprohibited.Driveshaft
safetyloopisrequired.TitaniumDrivelineComponentsprohibitedunlessGMOEMFactory
Equipped.Example:Yokes,wheelstuds,Axles,Etc.
REAREND
AnyOEMautomotivetyperearendpermitted.
BRAKES,STERRING&SUSPENSION:3
BRAKES
Frontandrearhydraulicbrakesarerequired.Carbonfiberbrakesareprohibitedunlessfactory
equipped(Z06,Z/28,ZR1).Automatedbrakesareprohibited.Theapplicationandreleaseof
thebrakesmustbeafunctionofthedriver.Dualreservoirmastercylinderisrequired.Line-lock
ispermittedonlyonthefrontwheelsusingoneline-lockbuttonandsolenoid.Anyother
electrical,pneumatic,hydraulic,etc.switchinbrakingsystemisprohibited.
STEERING
AnyOEMautomotiveproductiontypesteeringsystempermitted.
SHOCKS/STRUTS
Stockreplacementtypeshocksintherearandshocksorstrutsinthefrontarerequired.Coiloverstrutsarepermitted.Shock/strutmustmountinstocklocation.Shocks/strutsmustbe
stand-aloneandcannotbeadjustableduringarun.Rearcoilovershocksarepermitted.
Electronicprogrammableshocks/strutsareprohibited.Spindlemounttypestrutsare
prohibited.
FRONTSUSPENSION
Post1978andNewerVehicles:Stock,aftermarketortubulartypeK-memberpermitted.Kmembermustmountinitsoriginallocation.K-membermaybenotchedforoilpanclearance.
Factorystrut/shocktowersarerequired.Bolt-ontypecaster/camberplatesarepermitted.
Factoryorcommerciallyavailablecontrolsarmsandspindlesarepermitted.
Pre-1978andOlderVehicles:Theuseofcommerciallyavailablebolt-onfrontsuspensionkitsfor
enginefitmentispermitted.Factorystrut/shocktowersareallowedtobemodifiedforengine
fitmentandmustmaintainanOEMappearance.
REARSUSPENSION
Stockreartypeorladderbarsuspensionpermitted.Racingstyle4-linksuspensionsare
prohibited.Stocktypesuspensionmayutilizeanycommerciallyavailabledirectboltinshocks,
springs,leafspringsorfactorystyle3-link/4-linksuspensionsystemsfortheparticular
year/make/modelofcarbeingused.Leafspringsareallowedtobemovedinboard.Torquearm
stylesuspensionsareonlypermittedonOEMequippedvehicles.Bolt-ontractiondevices,
panhardbarsandanti-rollbarsarepermitted.AllNHRAStockEliminatorapproved
suspensions.StraightaxleconversiononCOPOCamarooranyGMcarwithfactoryIndependent
RearSuspensionarepermitted.
WHEELIEBARS
Theuseofwheeliebarsisprohibited.
FRAME:4
FRAME
Frontandrearframerailsmustremainunalteredandinthestocklocations.Rearframerails
maybenotched.StockfrontframerailsmayberemovedorreplacedforwardofK-member,or
forwardoffrontsuspensionlocationpoints.
WHEELBASE
Entriesmustretainstockwheelbasedimensionsof+or–1inch.Maximumwheelbasevariation
fromlefttorightis1inch.
GROUNDCLEARANCE
Aminimumof4inchesfromthefrontofthevehicleto12inchesbehindfrontspindle
centerlineismandatory.Aminimumof3inchesfortherestofthevehicleismandatory(except
foroilpanandexhaustheaders).
TIRES&WHEELS:5
TIRES
Theuseof28.0”X10.5”bias-plyslicksorsmaller,isrequired.Tiretreadmaynotextendoutside
ofthefender.
WHEELS
Aftermarketracingwheelspermitted.Spindlemounttypefrontwheelsareprohibited.
INTERIOR:6
UPHOLSTERY
Musthavefullfactorytypeupholstery,includingcarpet,doorpanels,headliner,andfactory
dash.Driver’sandpassenger’sseatsarerequiredandmountedinthestocklocation.
Aftermarketfrontseatsarepermittedandmustbeupholstered.Rearseat,heaterandA/C
controlsmayberemoved.
STEERINGCOLUMN/WHEEL
OEMorstocktypesteeringcolumnrequired.Steeringcolumnmusthaveafactoryappearance.
Removablesteeringwheelispermitted.
PEDALS
MustUseSuppliedAcceleratorPedalAssemblyincludedinChevroletPerformanceController
Kit.ChevroletPerformancePart#19329003
BODY:7
BODY
Bodymustretainoriginalappearancesandprofilesforyear,makeandmodelbeingused.OEM
bodyshellmustbeintact.Lightweightbodypanelsarerestrictedtohood,bumpersanddecklid/truck-lidorhatch.Hoodmaybealift-offstyleanddeck-lid/trunk-lidorhatchmustbe
hinged.Liftoffstyledeck-lid/trunk-lidorhatchisprohibited.Alterationsoraerodynamic
modificationsareprohibited.
HOODSCOOPS
Theuseofaftermarketforwardfacinghoodscoopsisprohibited.GMOEMhoodscoops
arepermittedandmustbesealedofffromfreshair.Cowlinductionstylehoodispermitted
withamaximumheightof6inches.Cowlheightwillbecheckedfromthetallestpointofthe
hoodtothefenderline.
COWLAREA
Cowlmustbecovered.
GRILLE
Grillemustbefullproductionformake,modelandyearbeingclaimed.Coveringinfrontofor
behindthegrilleisprohibited.
BUMPERS
Nobodycomponents,bumperadd-ons,sillplates,chinspoilers,bodykits,licenseplateframes,
etc.arepermittedtobeaddedtothenoseofthevehicle.‘’Outlaw”stylebumpersare
prohibited.
FIREWALL
Stock,unalteredfirewallisrequired.
FENDERSPLASHPANS
Full,factoryOEMoraftermarketinnerfendersarerequired.
WINDSHIELD&WINDOWS
ALLOEMglassisrequired.
FLOOR
Thedriver’s/passenger’sfloor,includingtransmissiontunnelmustbeunalteredandinthestock
location.TransmissionTunnelmaybemodifiedforTransmissionInstallation.Transmission
Tunnelmaynotberemovable.
WHEELWELLS
Factorywheelwells/tubsarerequired.Widening/sectioningfortirefitmentispermittedand
mustmaintainanOEMappearance.Wheelwellmodificationsarerestrictedto1978andolder
vehicles,1979-newerarerequiredtohavestockwheelwells.Aftermarketstylemini-tubsare
permitted.
WING/SPOILERS
Rearwing/spoilerispermittedwithamaximumlengthof26inches.Rearwing/spoilerwillbe
measurefromthetransitionpointofthedeck-lid/trunk-lidtotherearmostportionofthe
wing/spoiler.Anyadjustmentstothewing/spoilerduringarunareprohibited.
STREETEQUIPMENT
Functioning,Headlightsandtaillights/brakelightsarerequired.
APPEARANCE
Allcarsincompetitionmustbepaintedorwrapped.Advertisinggraphicsarepermittedonthe
body.InordertobeeligiblefortheNMCAofficialcontingencyprogram,allcontingency
sponsors’decalsmustbeeasilyvisibleandlocatedontheoutsideofthevehicle.Failuretodo
socanresultinthedriverforfeitingallclaimedcontingenciesforthatparticularevent.The
NMCArequiresthatallentriesrunthefollowingdecals:
1. NMCAWindshieldBanner:Decalneedstobelocatedonthetopofthewindshieldor
justabovethewindshieldlocatedonthebody.
2. NMCADragRacingSeries:Decals(2)mustbelocatedoneachsideofvehicle.Eitheron
thesidewindowsordecalscanbelocatedonthebodyrightbesidethesidewindows.
3. ClassSponsor:Decalmustbelocatedonthepassenger’ssidelowerportionofthe
windshield.
4. VPRacingFuels:OfficialFueldecals(2)required.Mustbelocatedoneachsideof
vehicle.(Inacontingencydecalmanner)
5. AerospaceWinnersCircle:Decals(2)mustbeprominentlydisplayedoneachsideof
vehicle.Failuretodosocanresultinthewinningdriverforfeitinghis/hersWinner’s
Trophy&Payout.
6. Class&CompetitionNumbers:Numbersmustbeeasilyvisible/legibleandlocatedon
thefront,back,andbothsidewindows.
ELECTRICAL:8
BATTERIES/CHARGINGSYSTEM
Mustbea12VoltBattery.Batterymayberelocatedandmustbeanautomotivetype.Charging
systemmustbefunctionalanduseOEM6-ribbeltthatiscrankdriven.
IGNITION
StockunmodifiedGMignitionisrequired.Standalonetwo-steprev-limiterispermitted.Twostepsystemsareallowedtopiggy-backwithexistingconnectorsandmustretainthestandard
functionsofatwo-step.AnymodificationsperformedtotheGMharnessoritssensorsare
strictlyprohibited.
MASTERCUTOFF
Amastercutoffswitchismandatoryonallvehicleswithabatterylocatedinthetrunk.
STARTER
Aftermarketstarters,instocklocationpermitted.
WIRINGHARNESS/LOOM
ChevroletPerformanceWiringHarnessPN#19166573
ChevroletPerformanceMapJumperHarnessPN#19202598
TheChevroletPerformanceengineharness/computerloomaremandatory.
Anymodificationstoharness/loomandanyelectricalsensorsareprohibited.
SUPPORTGROUPS:9
COMPUTER/DATARECORDERS
OnlyNMCAapprovedexternaldatarecorders,dataloggers,arepermitted.Anywide-band02
devicemustbecapableofonlyloggingair/fuelratio,andmaynotberuninclosedloopwithEFI
orignitionsystem.Onlyasingle02sensorispermittedtobeinstalledineachheadercollector.
PlaybacktachometerspermittedincludingthosethatrecorddriveshaftRPM.Laptops
prohibitedinvehicleduringcompetition.
ApprovedDataLoggers:
• Racepak:SportsmanSeries
• AEM:AQ-1
• Port-a-TreeData:ElectronicSwitchPanel
• Computech:DataMax
• RPMPerformanceProducts:DL10
• PerformanceTrends:DataMiteIII
• Altronics:DataQuest
INDICATORLIGHT
Asmall,remotemounted,indicatorlightwiredtothe(MIL)malfunctionindicatorlightwire
whichisavailableadjacenttothepedalcontrolassembly.Thelightmustbemountedinahighly
visiblelocationclosetotheALDL(techport)connector.TheMILwireprovidesgroundpathfor
remoteindicatorlight.
BRACKETRACINGAIDS
Theuseofanybracketracingsaidssuchasopticalsensors,delayboxes,shutterboxes,throttle
stops,etc.areprohibited.Theuseofanydevice(electricalormechanical)thatallowsadriver
toascertainthepositionoftheirvehicletothestartinglineisprohibited.
TOWVEHICLES
Theuseoftowvehiclesislimitedtobeingtowedtothestaginglanesandorawayfromthe
scales.Vehiclesmustdrivetoormanuallybepushedtothescalesproceedingeachqualifying
run.
CREWMEMBERS
Eachcrewmembermusthavetheproperstartinglinecredentialsandmustwerematching
attire.
DRIVER:10
DRIVER
Thedriverwheninthevehicle,fromthereadylineuntilthevehicleissafelystoppedonthe
returnroad,isrequiredtohaveallsafetyrestraintsystems(includingthehelmet)onandbe
securelyfastenedinthevehicleatalltimes
CREDENTIALS
AValidstateorgovernmentissueddriver’slicensebeyondalearner/spermitlevelmandatory
forcarsrunning10.00orslower.
AValidNHRAcompetitionlicenseismandatoryforcarsrunning9.99orquicker,atanNHRA
MemberTrack.NHRA/IHRAcompetitionlicensemandatoryatanIHRAMemberTrack.
Note:Itisultimatelythecompetitor’sresponsibilitytofamiliarizethemselveswiththeNMRA
classrequirementsaswellasallNHRAsafetyrequirements.Thecompetitoragreestheybear
theultimateresponsibilitywhenitcomestosafetyandhowitcomplieswiththeNMRAand
NHRArulebooks.Thecompetitoralsoagreesthatnooneelseotherthanthecompetitorisin
thebestpositiontoknowabouthowtheirparticularracecarhasbeenconstructedandhowto
safelyoperateit.