1.570 C/6 Exhaust Valve GM LS 8mm 4.915 AOL

The 1.570 C/6 Exhaust Valve GM LS 8mm is engineered for high-performance LS engine builds where precision valve geometry directly impacts combustion efficiency and power output. Built by FERREA, a manufacturer trusted by engine builders and performance shops worldwide, this exhaust valve serves as a critical component in any serious LS platform modification or rebuild. Whether you're assembling a street performance engine, race-ready track build, or restoring a classic with modern LS power, choosing the correct valve specification ensures optimal sealing, heat dissipation, and longevity under demanding conditions.

This exhaust valve features a 1.570-inch head diameter paired with an 8mm stem, delivering the flow characteristics necessary for aggressive cam profiles and high-RPM applications. The 4.915-inch overall length (AOL) ensures proper valve train geometry when paired with OEM or aftermarket LS valve seats and guides. FERREA's precision manufacturing yields tight tolerances and consistent dimensions across every valve, critical for cylinder-to-cylinder balance and predictable combustion. The C/6 designation indicates the specific seat angle and head profile optimized for LS combustor design, allowing maximum exhaust gas velocity while maintaining sealing integrity at peak cylinder pressures.

Engine builders and mechanics upgrading LS heads for increased displacement, boost, or naturally aspirated power rely on premium exhaust valves to withstand sustained heat cycles and prevent valve recession. This valve pairs seamlessly with OEM LS cylinder heads (LS1, LS2, LS3, LS7, and L92-type heads) as well as aftermarket aluminum heads from reputable manufacturers. Proper installation requires attention to valve guide clearance (typically 0.001–0.0015 inches for exhaust) and correct valve seat angles; consult your head supplier's specifications before installation. For customers rebuilding or modifying LS engines, purchasing matched sets—both intake and exhaust valves—ensures consistent performance across all eight cylinders.