Author: Cam March 31, 2006 at 20:51:26 from 71.80.112.94 in reply to: 30 degree exhaust valve in SBC posted by machine shop tom on December 27, 2005 at 18:34:10
I have tried many differant angles on SBC heads. The 30 works well only at lower lifts. I would assume that this is a fairly limited type of class... The gains that I have seen tend to only be at low lifts up to about .250. They hurt the upper lifts far more then they helped the lowers. All of the NASCAR heads are using 50+ degrees. If you are using the Serdi type cutters, email me and I will give you the profile numbers I used. Good Luck
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