SBC Rear Main Seal Full Circle Type 86-92

The SBC Rear Main Seal Full Circle Type 86-92 from FEL-PRO is a critical engine component engineered for Small Block Chevy and GM V6 powerplants manufactured between 1986 and 1992. This one-piece synthetic rubber seal prevents oil leakage at the crankshaft's rear main bearing journal—one of the most common leak points on vintage and modified small-block platforms. Whether you're restoring a classic Camaro, Corvette, or S10 truck, or refreshing a recently acquired engine, this OEM-quality seal is essential for maintaining proper oil containment and engine longevity.

FEL-PRO's full-circle design eliminates the two-piece split-ring configuration found in older seals, reducing installation complexity and improving reliability. The synthetic rubber compound resists heat, oil degradation, and thermal cycling—factors that cause traditional elastomer seals to harden and fail. This design also accommodates minor crankshaft runout common in high-mileage or rebuilt engines without sacrificing seal integrity. The compact profile (0.65 inches radial width) fits the factory groove precisely, ensuring zero installation modifications are needed on stock or lightly modified engines.

This seal is ideal for engine rebuilds, preventive maintenance on older SBC and V6 builds, and any application where rear main leakage has compromised oil cleanliness or created unsightly staining. Installation requires engine removal or pan-down access, making it a job best suited for DIY mechanics with proper equipment or professional shops. Compatibility is confirmed for 1986–1992 model years; verify your specific engine displacement and configuration before ordering. Proper installation using FEL-PRO's recommended procedures ensures years of leak-free operation without repeated seal replacement.