PROSTOCK
CLASSOVERVIEW
ProStockisaquartermileheadsupclassisdesignedtoshowcasethehorsepowerpotentialof
anaturallyaspiratedsmallblockengine.Maximumcubicinchdisplacementpermittedis401
inches.EntriesarepermittedtouseanyyearAmericanOEMproductionvehicleincluding
trucks.Crossbreedingofbrandsispermitted.Example:ChevroletengineinaFordbodiedcaror
truck.
Note:Thissetofclassrulesispresentedtoallcompetitorsundertheassumptionthatany
modificationsnotspecificallywrittenwithintheserulesshallbedeemedillegal,unlessthe
competitorhastheexpressedwrittenconsentfromtheNMCATechDirector.
RACINGFORMAT
Thisclasswillbeanallrunheads-upfield,NHRAProStyleLadderona.400ProTree.
ENGINEMAXCIDBASEWEIGHT
SmallBlock4012300
REQUIREMENTS&SPECIFICATIONS
ENGINE:1
ENGINE
Enginemustbeaninternal-combustion,reciprocating,naturallyaspirated,singlecamshaft,90degreesmallblockV8automotive-typeengine.Maximumenginesizeis401cubicinches.
BLOCK
FactoryOEMorDartsteelblocksaretheonlyengineblockspermitted.Allaluminumblocks,
bothcastandbilletareprohibited.Borespacingwillbedeterminedbycorporatemake(Dodge,
ChevyorFord)engineblockbeingused.
ENGINECOMPONENTS
Allmovingenginecomponentsarerestrictedtoaluminum,steel,iron,titanium,magnesiumor
otherconventionalalloys.Theuseofcarbonfiber,Kevlar,ceramics,composites,berylliumor
otherexoticmaterialsisprohibited.Pneumaticvalvetraincomponentsareprohibited.
HARMONICBALANCER
SFISpec18.1balancerisrequired.
ENGINEMOUNTS&LOCATION
Engine/motorplatesandmid-platesarepermitted.
ENGINECOATINGS
Theuseofenginecoatingsispermitted.
CRANKSHAFT
Anyaftermarketcrankshaftsarepermitted.
CONNECTINGRODS
Anyaftermarketconnectingrodsarepermitted.
PISTONS&PINS
Anyaftermarketpistonsandpinsarepermitted.
PISTONSRINGS
Anyaftermarketpistonringsarepermitted.
CAMSHAFTDRIVESYSTEM
Anycamshaftdrivesystemispermitted.
CAMSHAFT
Anycamshaftispermitted.
LIFTERS/LASHADJUSTERS
Anylifters/lashadjusterspermitted.
CYLINDERHEADS
Anyoverhead2-valvepercylindercommerciallyavailableaftermarketcylinderheadis
permitted.Billetcylinderheadsarepermitted.Brand/makeofcylinderheadbeingclaimed
mustmatchbrand/makeofengineblockbeingclaimed.Example:AclaimedFordcylinderhead
mustbeonaclaimedFordengineblock.
INTAKEMANIFOLD
Anyintakemanifoldispermitted.
OILINGSYSTEM
Anyoilingsystem,vacuumpumpandoilpanpermitted.
OILRETENTIONDEVICE
Allentriesarerequiredtohaveanoilretentiondevice.Thedevicecaneitherbeacustombuilt
ballisticblanketora‘’belly’’stylepan.Thepanmaybeconstructedfromcompositeormetal.It
musthaveverticalwallsofatleast2inchesinheight.Panmustextendfromframerailtoframe
railandmustextendfromfrontoftheenginemountingplatetotherearoftheengineblock.
Panmustbeattachedwithaminimumofthreeattachmentpointsperside.
COOLINGSYSTEM
Anycoolingsystempermitted.
EXHAUSTSYSTEM
Anyexhaustsystempermitted.Allexhaustsystemsmustbedirectedoutofbodyandaway
fromdriverandfueltank.
FUELSYSTEM
Anyelectronic,mechanicalorbeltdrivenfuelpumpsareallowed.Electronicfuelpumpsmust
shutoffwiththemasterelectriccut-offswitch.Fuelcellmusthaveapressurecapandbe
ventedtotheoutsideofthebody.FrontmountedfuelcellsmustmeetSFISpec28.1andbe
mountedbetweentheframerailsorenclosedinaroundtubeframe.Aroundtubeframemust
beconstructedofaminimumof1¼-inchO.D.x.065-inchchromemolytubing.Artificialcooling
orheatingoffuel(i.e.,coolcans,ice,Freon,etc.)prohibited.Circulatingsystemsthatarenot
partofthenormalfuelpumpsystemareprohibited.
EFISYSTEM
Anyaftermarketelectronicormechanicalfuelinjectionmaybeused.Fuelinjectorsize,andor
typeareunlimited.Thenumberoffuelinjectorspercylinderandinjectorplacementis
unlimited.
THROTTLEBODY
Anyaftermarketthrottlebody/bodiesarepermitted.
CARBURETOR
Anyaftermarketcarburetor/carburetorsarepermitted.
THROTTLELINKAGE
Throttlecontrolmustbeoperatedbythedriver’sfoot.
FUEL
NMCAspecifiedVPRacingFuelsC-45orQ-16gasolineistheonlyacceptablefuelallowed.The
NMCAreservestherighttocheckgasolineatanytimeduringcompetition.Failuretopassfuel
checkisgroundsfordisallowanceoftherunduringcompetitionanddisqualificationfromthe
eventduringeliminations.
DRIVETRAIN:2
CLUTCH,FLWHEEL&FLYWHEELSHIELD
FlywheelandclutchmeetingSFISpec1.2,1.3,1.4,or1.5ismandatory.Maximumnumberof
clutchdiscspermittedisthree.Minimumclutchdiscdiameterissixinches.Flywheelshield
meetingSFISpec6.2or6.3ismandatory.Clutchmustbemanuallyoperatedbythedriver’s
foot.Electronics,pneumatics,hydraulics,oranyotherdevicemayinnowayaffecttheclutch
system.Thethrow-outbearingmustreleaseallfingers,levers,stages,etc.simultaneously.
Stagedorvariablereleaseclutchesareprohibited.
MANUALTRANSMISSION
Anyaftermarkettransmissionswithamaximumof5forwardspeedspermitted.Clutchless
modelspermitted.Anygearchangemustoccurfromdirectactionbythedriver.Pneumatic,
electric,hydraulic,etc.shiftersprohibited.
DRIVELINE
Anysteel,aluminumorcarbonfiberdriveshaftmeetingSFI43.1specispermitted.
REAREND
Anyautomotivetyperear-endispermitted.Maximumdiameterforring-n-piniongearis9.5
inches.
BRAKES,STEERING&SUSPENSION:3
BRAKES
Automatedbrakesareprohibited.Theapplicationandreleaseofthebrakesmustbeafunction
ofthedriver.Fourwheelhydraulicdiscbrakesaremandatory.Steelbrakelinesaremandatory.
Brakelinesmustbeoutofflywheelanddrivelineareas.Line-lockispermittedonlyonthefront
wheels.Oneline-locksolenoidwithonebuttonispermitted.Anyotherelectrical,pneumatic,
hydraulic,etc.switchinbrakingsystemisprohibited.Dualmastercylinderismandatoryand
mustbemountedabovethelowerframerails.
STEERING
Anyautomotivetypesteeringsystempermitted.Ifcompetitorisusingacommerciallyavailable
quickdisconnectsteeringwheel,itismandatorythatitmeetSFISpec42.1.
SHOCKS/STRUTS
Coilovershocksarepermittedfrontandrear.Electronicprogrammableshocksarepermitted.
Eachvehiclemustbeequippedwithoneoperatingshockforeachsprungwheel.Active
suspensionsystemsofanykindareprohibited.
REARSUSPENSION
Anyracingstyle4-linksuspensionsystempermitted.
WHEELIEBARS
Wheeliebarsarepermitted.Wheelsmustbenon-metallic.
FRAME:4
CHASSIS
ChassismusthaveaSFI25.1certificationandhaveeitheraNHRAorIHRAserializedsticker
attachedtotherollcagebeforecompetition.AvalidNHRAserializedstickerismandatoryatan
NHRAMemberTrack.
WHEELBASE
Minimumwheelbaseis104inchesandmaximumis115inches.Full-sizedtrucksarealloweda
maximumof140inches.Mid-sizedtrucks(i.e.,S-10,Ranger,andDakota)arealloweda
maximumof125inches.Maximumwheelbasevariationfromlefttorightis1inch.
GROUNDCLEARANCE
Aminimumof3inchesfromthefrontofthevehicleto12inchesbehindfrontspindle
centerlineismandatory.Aminimumof2inchesfortherestofthevehicleismandatory(except
foroilpanandexhaustheaders).
TIRESANDWHEELS:5
TIRES
Tiresmaynotextendoutsidethebodyline.Alltiresmusthavethemanufacturer,modeland
sizeinformationclearlydesignatedonthetire.
WHEELS
SFISpec15.1or15.3rearwheelsarepermitted.Lighteningoranyothermodificationtorear
wheelsisprohibited.Wheelsdiscsorcoversareprohibited.
INTERIOR:6I
UPHOLSTERY
Driver’sseatmustbeaminimumheightof24inches.
SHEETMETAL
Drivercompartmentinteriormustbealuminum,steelorcarbonfiber.Theuseofmagnesiumis
prohibited.Sheetmetalmaynotextendintorearwindoworbehigherthanthewheeltubs.The
trunkmustbecompletelyseparatefromdriver’scompartmentusingafirewall.
BODY:7Y
BODY
OnlyAmericanproductionbodystylespermitted.Onepiecefunnycarbodiesareprohibited.
Lightweightaftermarketreplicabodycomponentsarepermittedaslongastheyhavethesame
appearanceasthebodybeingused.Bothdoorsmustbefunctionalfrominsideandoutsideof
thevehicle.Frontoverhangislimitedto45inchesmeasuringfromthefrontspindle.Ifthebody
selectedhasanoverhangoflessthan45inches,aNMCAacceptedextensionmaybeusedto
reachthemaximumlength.Allentriesmusthaveametaldeflectororfirewallextension
betweenthefendersandtheleadingedgeofthedoorssothatfire,liquids,etc.cannotcome
intothedriver’scompartment.
HOOD&HOODSCOOP
Hoodscoopsarepermittedandareallowedtohaveoneopening.Vehiclesthatareequipped
withanEFIsystemarenotrequiredtorunahoodscoop.Carburetorsmustbecompletely
coveredbythehoodorhoodscoop.
FIREWALL
Aminimumof.024inchsteelortitaniumfirewallismandatory.Theuseofaluminum,
magnesiumorcarbonfiberintheconstructionofafirewallisprohibited.
WINDSHIELD&WINDOWS
Fullwindowsaremandatory.Windowsmustbeclosedandnotoperative.Cuttingornotching
ofwindshieldpermittedifcoveredbythehoodorhoodscoop.Minimumofa4inchdiameter
openingonsidewindowsismandatory.Windowscanbemadefrom1/8thinchpolycarbonate
material.
FLOOR
Driver’ssidefloorpanmustbesteelandweldedintoplace.Theremainderofthefloorsection
canbe.024inchsteel,.032inchaluminum,orcarbonfiber.Theuseofmagnesiumis
prohibited.
WHEELWELLS/TUBS
Rearwheelwells/tubsmustbeseparatefromeachtire.
WING/SPOILERS
Anystyleofrearwing/spoilerispermitted.Anyadjustmentstothewing/spoilerduringarun
areprohibited.Minimumwickerheightis¼inch.
TAILLIGHT
Onefunctionaltaillightismandatory.
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
BATTERY
Maximumoftwobatteriesareallowed.
IGNITION
Anyelectronicignitionsystemisallowed.
STARTER
Allentriesmustbeself-startingwithanonboardstarter.
MASTERCUTOFFSWITCH
Amastercutoffswitchismandatory.
SUPPORTGROUP:9
COMPUTER/DATARECORDERS
Computer/datarecordersarepermittedandmuststandaloneandtobeonlyusedfor
informationgatheringpurposes.
TOWVEHICLES
Theuseoftowvehiclesispermitted.
CREWMEMBERS
Eachcrewmembermusthavetheproperstartinglinecredentialsandmustwerematching
attire.
DRIVER:10
DRIVER
Thedriverwheninthevehicle,fromthereadylineuntilthevehicleissafelystoppedonthe
returnroad,isrequiredtohaveallsafetyrestraintsystems(includingthehelmet)onandbe
securelyfastenedinthevehicleatalltimes
CRENDENTIALS
AValidstateorgovernmentissueddriver’slicensebeyondalearner/spermitlevelis
mandatoryforcarsrunning10.00orslower.AvalidNHRAcompetitionlicenseismandatoryfor
carsrunning9.99orquicker,ataNHRAMemberTrack.AvalidNHRAoranIHRAcompetition
licenseismandatoryatanIHRAMemberTrack.
Note:Itisultimatelythecompetitor’sresponsibilitytofamiliarizethemselveswiththeNMRA
classrequirementsaswellasallNHRAsafetyrequirements.Thecompetitoragreestheybear
theultimateresponsibilitywhenitcomestosafetyandhowitcomplieswiththeNMRAand
NHRArulebooks.Thecompetitoralsoagreesthatnooneelseotherthanthecompetitorisin
thebestpositiontoknowabouthowtheirparticularracecarhasbeenconstructedandhowto
safelyoperateit.