New Mr Gasket #29 Rear Main Seal, 1986-Up Small Block Chevy. Mr Gasket 29 Rear Main Seel, 1986-Up Small Block Chevy Sku # 55029 Mfr. Part # 29 Condition New Brand Mr Gasket Sold Each Mr Gasket 29 Rear Main Seel, 1986-Up Small Block Chevy Details Info Made from silicone to withstand extreme engine oil temperatures and injection molded for a precise fit. Rear Main Seal - Small Block Chevy 1986 & Later w/ 1-Piece Seal
