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1977- Early85GrandNational/T-TypeARPHeadBoltKitProSeries12Point Head(BuickV6)3.8Liter14Boltoilpanengines. Allproseriesboltsarecoldforgedtoensuremolecularintegrity,heat treatedpriortothreadrollingandmachining,andareratedat190,000psi. ARPProseriesheadboltsareapplicationspecific-designedforusewith typicallycompetitiononlycomponents.Thesefastenersdeliversuperior strengthandmeettheARP"ZeroDefect-ZeroFailure"qualitystandard. Hardenedandparallelgroundwashersareincludedwitheachkittoensureeven loaddistributionandaccuratetorquereadings.Allproseriesboltshavea reducedwrenching12pointheadandwideflangeareatoeliminatetheneed forvalvetrainremovalforcylinderheadre-torqueingandpermitstheuse oflargediametervalvesprings.