Stainless Exhaust Valve 1.540

The Ford Stainless Exhaust Valve 1.540 (M-6505-G302) is a precision OEM-equivalent replacement component engineered for Small Block Ford cylinder heads. This stainless steel exhaust valve features a 1.540-inch head diameter, 11/32-inch valve stem, and 5.078-inch overall length—specifications that match Ford's factory tolerances for direct bolt-in installation. Stainless construction provides superior corrosion resistance and heat tolerance compared to standard steel, extending valve life in high-temperature exhaust environments.

The 1.540-inch head diameter is the critical specification for Small Block Ford compatibility, ensuring proper sealing geometry and combustion chamber fit. The 11/32-inch stem diameter maintains precise guide clearance, essential for consistent valve train operation and preventing worn guides from causing gas leakage and compression loss. At 5.078 inches long, this valve integrates seamlessly with factory pushrods, rocker arms, and seat angles. Stainless material resists oxidation in the harsh exhaust port environment where temperatures regularly exceed 1,100°F, preventing the stem galling and seat recession that can occur with uncoated steel valves over extended use.

This exhaust valve is ideal for engine builders, restoration specialists, and performance enthusiasts rebuilding Small Block Ford heads for street, marine, or competition applications. It's suited for both stock rebuild scenarios and modified engine packages where improved heat dissipation benefits longevity. Whether you're restoring a classic 289, 302, or 351W, or refreshing an existing engine, this OEM-spec stainless exhaust valve delivers the reliability and durability expected from Ford's original engineering.

Sold individually, this valve may be purchased as part of a complete valve set or as a replacement unit. Stainless exhaust valves are particularly valuable in applications with marginal cooling or extended idle periods, where steel valves face accelerated oxidation. Always verify head compatibility and seat angle before installation to ensure proper seating and performance.