Edelbrock 1- Pont Perf RPM 60579 Int Valve 2 110 X 5 093

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 #9781 Intake Valve is a 2.11" 1-piece, swirl-polished, hardened tip stainless steel valve with undercut stems for increased flow. Fits Edelbrock #60579, #61579 & #61599 Cylinder Heads. Overall Length: 5.093" Edelbrock Performer RPM Single-Stage Nitrous System #70093 is designed for use on carbureted V8s. Power increases can be adjusted from 100-250 hp. This system is for use with 4500 Series carburetors and has a polished bottle. Pontiac:-:326 (5.3L)-455 (7.5L)