Rear Main Seals

Oil seepage at the crankshaft is one of the most common—and preventable—failures in Small Block Chevy engines. A failing rear main seal compromises engine integrity, causes messy leaks, and accelerates wear on other components. The C5680 two-piece design...

A leaking rear main seal costs you oil, reliability, and peace of mind—especially when you're pushing your Small Block Chevy to its limits. This 2-piece design delivers superior sealing performance where it matters most, keeping your crankshaft protected...

A failing rear main seal is one of the most common causes of oil leakage in classic Small Block Ford engines—and it's a leak that only gets worse with time. This OEM-spec replacement seal restores the critical barrier between your crankshaft and engine...

A leaking rear main seal is a silent performance killer, robbing you of oil pressure and creating messy driveways. If you're running a 351W block with a 302 crank, this OEM-equivalent seal is your direct path to a dry engine bay and reliable long-term...