SBC Rear Main Seal - 2-Piece Viton

The SBC Rear Main Seal - 2-Piece Viton from SCE Gaskets is the critical sealing solution for small block Chevrolet engine builders and restorers who demand reliability at the crankshaft. This two-piece design addresses one of the most common leak points in any engine—the rear main bearing cavity—where constant rotation and pressure cycles can compromise inferior seals over time. Whether you're completing a full engine rebuild, upgrading from a worn factory seal, or assembling a performance engine, this Viton rear main seal provides the durability and leak-free operation that separates professional-grade builds from amateur shortcuts.

Viton fluoroelastomer material is the industry standard for rear main seals because it resists oil degradation, maintains elasticity across wide temperature ranges, and seals against the high rotational speeds inherent to small block Chevy applications. The two-piece configuration allows for precise installation without full crankshaft removal on many engine setups, reducing labor and the risk of damage during installation. SCE's design ensures proper contact between the seal and crankshaft journal while withstanding the mechanical stress of constant rotation and the chemical exposure of hot engine oil—performance characteristics that commodity seals simply cannot match.

This seal is essential for anyone rebuilding or freshening a small block Chevrolet engine, from vintage muscle car restorations to modern street and race builds. Proper installation with clean surfaces and correct torque specifications on the seal retainer will provide years of leak-free operation. The compact dimensions and lightweight construction (0.11 lbs) make handling and alignment straightforward during assembly, and compatibility with all standard SBC configurations ensures fit without modification or compromise.