BOP Big Block Ford One-Piece Lip Viton ® Rear Main Seal

The BOP Engineering One-piece rear mail seal is the most advanced rear main seal on the market for the traditional Big Block Ford V-8. This revolutionary design features a number of state of the art innovations including relocation of the parting line which greatly reducing the risk of leaking, a more pliable construction that will work more effectively in engines with seal groove geometry issues, and state of the art lip design provides protection against leakage as well as supporting outstanding vacuum numbers. Crankshaft must be out of the block to fit this seal prior to installation. Fits Ford 429 & 460 CID