Valve Seat - SBC Exhaust 1.696 O.D.

The Valve Seat – SBC Exhaust 1.696 O.D. is a precision replacement component engineered for small-block Chevrolet (SBC) cylinder heads. This iron valve seat is designed for builders, machine shops, and performance enthusiasts who demand OEM-equivalent or upgrade-quality sealing surfaces for exhaust valve applications. Whether reconditioning a stock head or assembling a high-performance engine, a properly fitted valve seat ensures reliable sealing, optimal combustion efficiency, and extended component life.

Manufactured by Air Flow Research (AFR), a trusted name in cylinder head technology, this exhaust valve seat features a 1.696-inch outer diameter with a 1.600-inch inner diameter and is constructed from cast iron for superior heat dissipation and durability. The iron construction resists thermal cycling and maintains dimensional stability under sustained high-temperature exhaust gas exposure, critical for preventing valve recession and maintaining proper valve-to-seat contact. Precision machining ensures concentricity and a consistent sealing surface that mates securely with the valve face for minimal blow-by and maximum compression retention.

Engine builders installing or reconditioning small-block Chevrolet heads benefit most from this component, particularly those targeting street performance, circle-track racing, or marine applications where exhaust valve durability is paramount. Installation requires proper press-fitting into the cylinder head counterbore using appropriate tooling; this valve seat is sold individually, allowing builders to purchase exactly what they need for their project. Compatible with all standard SBC head configurations using 1.696-inch exhaust seat bores, this replacement part restores factory sealing geometry and supports both stock and modified engine programs.