The Ford Performance BOSS block capability has been proven around the world '' both on the track and on the street. And, all Ford Performance BOSS blocks are cast and machined to the highest industry standards in the USA. Requires special length 1/2 in. head bolts M-6065-BOSS or head studs M-6014-BOSS recommended with M-6049-X306/307/Z304DA heads. Designed to be compatible with the original 302 and 351W blocks. Retains clutch cross shaft pivot hole. Original Style oil filter location; Original motor mount boss locations; Original bell housing pattern; Weighs approximately 195 lbs.; Great price and value; The foundation for big bore 9.2 in. deck engine projects.