SBC S/D 1.600 Exhaust Valves 8mm AFR Heads

The SBC S/D 1.600 Exhaust Valves 8mm AFR Heads are precision-engineered components designed for small-block Chevrolet engines running modern AFR (Air Flow Research) cylinder heads with an 8mm valve stem diameter. These valves are essential for builders and enthusiasts pursuing high-performance applications where reliable exhaust flow, durability under sustained RPM, and thermal stability are critical. Whether you're assembling a street performance engine, a track-focused build, or a competition platform, quality exhaust valves directly impact horsepower delivery, fuel efficiency, and component longevity.

Manufactured by Manley Performance, these SBC S/D exhaust valves feature a 1.600-inch head diameter optimized for AFR's ported cylinder head design, maximizing exhaust scavenging efficiency while maintaining structural integrity at high temperatures. The 8mm stem diameter ensures proper fitment within AFR's precision valve guides and rocker arm geometry. Manley valves are forged from specialized alloy steel and undergo rigorous quality control, offering superior fatigue resistance and thermal conductivity compared to stock units.

These valves are ideal for SBC engine builders running AFR 195 or AFR 200 series cylinder heads who demand reliability and performance. The stem-to-head ratio and valve face angle are calibrated to work seamlessly with AFR's port floor design, enabling efficient exhaust gas evacuation and improved engine breathing across the RPM band. With these high-quality exhaust valves, builders can ensure optimal performance and longevity in their engine builds.