BBC S/F 1.725in Exhaust Valve

The BBC S/F 1.725in Exhaust Valve by Manley is designed for serious big-block Chevy engine builders and performance enthusiasts. This exhaust valve is built to withstand the extreme thermal and mechanical demands of high-revving, high-horsepower big-block applications, ensuring reliable power delivery and maintaining cylinder-head integrity.

Featuring a 1.725-inch head diameter, this valve is optimized for large-port BBC cylinder heads, providing excellent flow characteristics and thermal transfer essential for high-output engines. Manley's manufacturing process utilizes premium materials and precision tolerances, ensuring consistent valve seat contact and minimal leakage even under extreme combustion pressures.

Ideal for builders upgrading cylinder-head assemblies on big-block Chevrolet engines for street, strip, or road-race applications, the S/F designation indicates a standard face angle, making this valve compatible with properly prepared BBC cylinder heads without the need for custom machine work.