Rear Main Seal - BBM & Hemi

The FEL-PRO Rear Main Seal for BBM and Hemi engines is a two-piece synthetic rubber seal engineered to prevent oil leakage at the crankshaft's rear main bearing point. This is a critical engine component that operates under continuous pressure and thermal cycling, making seal integrity essential to long-term engine reliability and oil containment.

Designed specifically for Mopar B-series and RB-series engines including the legendary 426 Hemi, this FEL-PRO rear main seal uses synthetic rubber construction for improved durability and resistance to oil degradation compared to traditional elastomer materials. The two-piece design allows installation without full engine disassembly, reducing labor time during rebuilds or maintenance. FEL-PRO's engineering focuses on precise dimensional tolerances to ensure proper sealing pressure against the crankshaft while minimizing friction that could affect engine efficiency.

This seal is essential for anyone rebuilding or restoring a classic Mopar big-block engine, whether for street performance, restoration projects, or competitive applications. Engine builders and restoration specialists depend on FEL-PRO seals to maintain proper compression and prevent oil seepage that could damage bearings or compromise engine longevity. Proper rear main seal replacement is a fundamental maintenance step whenever the engine experiences significant teardown or when original seals show signs of weeping.

FEL-PRO is recognized in the engine rebuilding industry for producing seals and gaskets that meet OEM specifications while offering improved material science. This rear main seal (part number 2947) represents a direct replacement solution for stock and performance applications where maintaining factory-correct fit and function is critical to engine integrity.