1-Piece Rear Main Seal-4.312″ (Fits: 351C, 351M, early(up to 7/10/’83) 351W & 400 not 289/302 blocks)

Description

1-piece rear main seal, Viton material

This seal is designed to have the exact size of the 2-piece seal, but in a 1-piece design.

This will allow the customer to slide the seal over the crankshaft flange end and then lower the crankshaft into the block. No machining is required. Our goal is to have this seal designed so that in the case of a rear main oil leak, the seal can be cut, and removed. A new seal could also be cut and then installed the same way. Or an OE 2-piece seal could be used. Cutting the seal is NOT required; only an option.

The Track Boss rear main seal is the same manufacturer Kaase Racing Engine uses.

“Using the same manufacturing source as the Sprint Cup teams and following several years of testing, the seal makers produced the tooling, the prototype seals and now the production items exclusively for Kaase.” – Kaase Racing engines