Mr. Gasket Rear Main Seal Gaskets

Mr. Gasket Rear Main Seal Gaskets deliver proven, reliable oil sealing at the engine's most critical leak point — the rear main journal. Engineered for street rebuilds, muscle car restorations, and performance builds alike, this product line carries the trusted quality that has made Mr. Gasket a go-to name among professional engine builders and experienced DIYers for over half a century.

Key Features:

• Premium Sealing Materials: Available in high-quality silicone and Viton® rubber formulations engineered to withstand extreme engine oil temperatures and chemical exposure
• Injection-Molded Construction: Precision manufacturing ensures consistent tolerances and a proper, leak-free fit across a wide range of engine applications
• Rope Seal Upgrade Capability: Serves as a superior modern replacement for older-style factory rope seals, as well as a direct replacement for OEM rubber main seals
• Thermal Cycling Resistance: Built to endure repeated heat-and-cool cycles without cracking, shrinking, or losing sealing integrity
• Emissions Compliant: Approved for use on emissions-controlled vehicles, non-emissions-controlled vehicles, and racing applications
• Professional-Grade Reliability: Trusted by racers and engine builders since 1964, backed by the Mr. Gasket legacy of sealing performance

Founded by drag racer Joe Hrudka and now a core part of the Holley Performance family, Mr. Gasket has been delivering race-proven sealing solutions for street and competition engines for decades. Whether you're performing a routine rear main seal replacement or completing a full engine rebuild, the Mr. Gasket rear main seal line provides the fit, materials, and durability needed to get the job done right the first time.