supercatxr7
Registered User
Here's the flow data after Stiegemeier's work. My heads had some porting, bowl work, and bigger valves (1.937 Intake and 1.55 exhaust) put in them from another source a couple of years ago, but I decided to have Stiegemeier go back through them and do some welding and such. Numbers are as follows with a diffuser:
After Stiegemeier's work:
Lift .200 .300 .400 .500 .550
Int. CFM 126 172 200 211 211
Exh. CFM 116 186 191 210 215
Before their work, I had the following flow numbers and made over 300 rwhp with Fred's 520 cam:
Lift .200 .300 .400 .500 .550
Int. CFM 105 126 181 205 208
Exh. CFM 99 128 145 147 147
Now off to Fred for a nice cam grind to match... Stiegemeier recommended not going over a .570 lift due to the heads not flowing much after that.
After Stiegemeier's work:
Lift .200 .300 .400 .500 .550
Int. CFM 126 172 200 211 211
Exh. CFM 116 186 191 210 215
Before their work, I had the following flow numbers and made over 300 rwhp with Fred's 520 cam:
Lift .200 .300 .400 .500 .550
Int. CFM 105 126 181 205 208
Exh. CFM 99 128 145 147 147
Now off to Fred for a nice cam grind to match... Stiegemeier recommended not going over a .570 lift due to the heads not flowing much after that.
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