SBC 2 Piece Rear Main Align Bored 400 Mains

The SBC 2 Piece Rear Main Align Bored 400 Mains from FEL-PRO is a precision-engineered seal designed specifically for small-block Chevrolet engines with 400 main journal diameters and align-bored blocks. This two-piece configuration is essential for builders and mechanics who are restoring or upgrading classic muscle cars, performance street engines, and competition builds where crankshaft integrity and oil containment are critical.

The rear main seal acts as a vital barrier between the engine's internal lubrication system and the external environment, making high-quality construction essential for long-term reliability. FEL-PRO's two-piece design utilizes advanced elastomer compounds and precision molding to ensure a perfect seal under the extreme pressures and temperatures found in high-revving small-block applications. The align-bored specification guarantees compatibility with blocks that have been precision-align-honed to exacting tolerances.

This rear main seal is particularly beneficial for SBC engine builders working with 400 main journal sizes, as its dual-piece construction allows for easier installation and removal without the need for full engine disassembly. This feature is a significant advantage during rebuilds or crankshaft replacement scenarios. With FEL-PRO's reputation for OEM-quality materials and dimensional accuracy, this seal is designed to perform consistently across extended break-in periods and high-load operations.