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.