Edelbrock 8- BBC Perf RPM Intake Valves 2 190 X 5 300

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 #9775 Intake Valve is a 2.19" 1-piece, swirl-polished, hardened tip stainless steel valves with undercut stems for increased flow. Fits Edelbrock #60459, #60479, #60499 & #60559 Heads. Edelbrock Performer RPM Single-Stage Nitrous System #70033 is designed for use on carbureted V8'S. Power that can be adjusted from 100-250 horsepower. This system is for use with square-bore carburetors and has a polished bottle. Chevrolet:Big-Block Mark IV:396 (6.5L)-502 (8.2L)