BBC Rear Main Seal & STG 2 Buick V6 2&3 Design

The FEL-PRO BBC Rear Main Seal & STG 2 Buick V6 2&3 Design is a precision-engineered replacement seal designed for Big Block Chevy and Buick V6 engines requiring a two-piece silicone construction. This rear main seal prevents oil leakage at the crankshaft's rear journal, a critical failure point in aging engines where factory seals have hardened or cracked. Engine builders, restoration specialists, and DIY enthusiasts rely on this seal to eliminate messy oil seepage and protect engine components from contamination during complete overhauls or routine maintenance.

Constructed from durable silicone material, the BBC Rear Main Seal & STG 2 design incorporates FEL-PRO's two-piece architecture, which allows for easier installation without requiring full engine disassembly in many applications. The silicone compound resists thermal cycling, maintains flexibility across temperature extremes, and resists degradation from modern detergent oils better than older Neoprene alternatives. The staged design (STG 2) accommodates both Buick V6 2 and 3 variations, making this a versatile solution for multiple engine generations within the Big Block Chevy and Buick platform families.

This seal is ideal for owners performing transmission rebuilds, crankshaft service, or complete engine restorations who cannot tolerate rear main oil leaks. Installation requires careful alignment with the crankshaft diameter and proper seating in the block's rear recess; consult your engine's service manual for exact positioning. The compact 4.85 x 0.9 x 7.05 inch profile fits standard Big Block Chevy and Buick V6 engine bays, and the lightweight 0.1 lb construction poses no installation burden.