Edelbrock 1- BBC Perf RPM Exhaust Valve 1 880 X 5 450

1-piece, swirl-polished, hardened tip stainless steel exhaust valves with undercut stems for increased flow. Hard-chromed valve stems are 11/32in. except where noted The Edelbrock #9771 Exhaust Valve is a 1.88" 1-piece, swirl-polished, hardened tip stainless steel valve with undercut stems for increased flow. Fits Edelbrock #60459, #60479, #60499, #60559 & #60439 Cylinder Heads Edelbrock part #182031 is a 80GPH In-Line Electric fuel pump featuring a red anodized aluminum housing and high-quality internals, resulting in both a strong and durable design. Chevrolet:Big-Block Mark IV:396 (6.5L)-502 (8.2L)