Pontiac 400 Viton Rear Main Seal

The Pontiac 400 Viton Rear Main Seal (SCE 22804) is a critical engine component designed to prevent oil leakage at the crankshaft's aft position, where the transmission meets the engine block. This seal is essential for any Pontiac 400 big-block owner performing engine rebuilds, restorations, or addressing chronic oil weeping at the bellhousing. Whether you're freshening a stock engine or upgrading a performance build, a quality rear main seal is non-negotiable for long-term reliability and keeping your oil where it belongs—inside the engine.

SCE Gaskets engineered this seal using Viton elastomer, a premium fluorocarbon material chosen for superior heat and oil resistance compared to traditional Neoprene compounds. Viton seals maintain their elasticity across a wider temperature range, preventing hardening and cracking that lead to leaks in high-performance or long-duration street and strip applications. The Pontiac 400 Viton Rear Main Seal is precision-sized to fit the 400's unique crankshaft journal diameter and block bore, ensuring a snug, reliable fit that won't slip or extrude under pressure. This material selection directly translates to extended seal life and fewer comebacks—critical when you've invested the labor into a full engine teardown.

Technicians and enthusiasts rebuilding Pontiac 400 engines will find this seal indispensable during full gasket sets and crankshaft service. Installation requires removal of the transmission and rear crankshaft seal retainer, making it a natural part of any major drivetrain work. The compact 5.75 x 0.65 x 7.7 inch profile fits the original equipment design envelope, ensuring drop-in compatibility without modification. Specify SCE's Pontiac 400 Viton Rear Main Seal (MPN 22804) when sourcing OEM-quality sealing for your next rebuild—it's the choice of shops that value durability over repeated comebacks.