Cometic Pontiac 389/421 V8 4.3in Bore .040in MLS Head Gasket

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: Year Make Model Submodel 1949-1954 Jaguar XK120 Base 1952-1954 Jaguar XK120 M 1955-1957 Jaguar XK140 Base 1955-1957 Jaguar XK140 M 1955-1957 Jaguar XK140 MC 1958-1961 Jaguar XK150 Base 1958-1961 Jaguar XK150 S 1959-1966 Pontiac Bonneville Base 1959-1962 Pontiac Bonneville Custom 1959-1966 Pontiac Bonneville Safari 1964-1966 Pontiac Catalina 2+2 1959-1966 Pontiac Catalina Base 1959-1966 Pontiac Catalina Safari 1962-1966 Pontiac Catalina Ventura 1962-1966 Pontiac Grand Prix Base 1964-1966 Pontiac GTO Base 1959-1966 Pontiac Star Chief Base 1966 Pontiac Star Chief Executive 1961,1963-1966 Pontiac Tempest Base 1964-1965 Pontiac Tempest Custom 1961 Pontiac Tempest LeMans 1961,1963-1966 Pontiac Tempest Safari 1960-1961 Pontiac Ventura Base