Cometic Pontiac 326 / 389 / 421 V8 .070in MLS Cylinder Head Gasket – 4.300in Bore

The HP shim technology increases clampload around the combustion chamber, thereby increasing the sealability of the head gasket around the open deck block.This Part Fits:YearMakeModelSubmodel1959-1966PontiacBonnevilleBase1959-1962PontiacBonnevilleCustom195