Spin on oil filter housing for performance engines-made out of billet alloy it has a stong mating face to the block where oil leakage occurs from high revving engine vibrations, is slightly shorter offering more clearance and has the bypass valve omitted for increased safety. Looks great as well but should be used with our braided hose kit for safety. Can be used as a direct replacement for TAM2097 which was for pre 12A engine blocks. Pre 1992 engines have 5/8" block union and 1/4" npt thread for the filter head 12A engines from 1992 on have 11/16"UNF block and filter head This filter head has a 1/4NPT thread wich is basically a half inch hole restricting down to a 3/8" size hole