Cylinder Head Runner Volumes

[Ed Wright]

Rich, I did a set of quicky LT1 SS heads myself last spring when I got a wild hair to go SS racing again (In like three weeks, I'm not real bright.). I had two sets of salvage yard castings, all poured very close to each other. NHRA said 175 cc intakes, all of mine were very close to 170. Exhausts were about 5 small also. I can't imagine how a set could be 165 cc. Even a valve job would not make them that much smaller.
Had the intake gasket surface been cut? Were your end chambers smaller than the centers? All four of mine were, like over 1/2 cc.

Sending one set to Dave Layer was a very good move. 40 ftlbs better than mine.

[Rich Biebel]

Originally Posted by Ed Wright

Rich, I did a set of quicky LT1 SS heads myself last spring when I got a wild hair to go SS racing again (In like three weeks, I'm not real bright.). I had two sets of salvage yard castings, all poured very close to each other. NHRA said 175 cc intakes, all of mine were very close to 170. Exhausts were about 5 small also. I can't imagine how a set could be 165 cc. Even a valve job would not make them that much smaller.
Had the intake gasket surface been cut? Were your end chambers smaller than the centers? All four of mine were, like over 1/2 cc.

Sending one set to Dave Layer was a very good move. 40 ftlbs better than mine.

Ed...I am going by memory on the LT-1 heads and they came up about 7 or 8 cc's under the max on the intake side. Those heads came with the car I bought as a roller. They were prepped by Heads-up and I just puffed them up very lighty and rechecked all the chambers for CC's. Straight stemmed valves, not undercut and they came with the heads. Being a "newby" at the time at building this Stocker engine...I relied on some parts and help from Woodro and I was able to run some decent numbers. I needed a man like you to help me tune the ECU as I see you are very skilled at that.........Hi Billy......