BBC Rear Main Seal 2pc Silicone 65-90

The BBC Rear Main Seal 2pc Silicone 65-90 is an essential component for preventing crankshaft oil leaks in Big Block Chevrolet engines produced from 1965 to 1990. This product is ideal for those restoring classic muscle cars or rebuilding high-performance engines, providing a reliable solution for a common issue in vintage engines.

Constructed from premium silicone, this two-piece seal assembly replaces the factory rope-style rear main seal, which can harden and leak over time. The silicone material offers superior resistance to heat, oil degradation, and compression, ensuring a long-lasting seal that outperforms traditional options. Its two-piece design allows for easier installation without the need to remove the crankshaft, saving time and labor costs.

Engine builders and mechanics will appreciate the drop-in compatibility of this seal with both stock and modified cranks from the 1965–1990 production range. The design maintains factory journal dimensions and requires no block modifications, making it a straightforward upgrade for any BBC restoration or rebuild project.