Originally Posted by Cab_Burge
I've seen what happen to your motor on a engine dyno doing testing, I'm almost positive it was, is, caused by to little spring pressure for the RPM that motor is turning with that CAM work scope


I know too little pressure can cause major issues at high rpm... but explain how it worked fine with stock-type (3/8" stem, 2.08/1.74) valves using the same set of springs, rockers, pushrods? It should be about 130 on the seat and 430 over the nose from the Comp tables. For almost 1400 miles, and NEVER going above 5200 rpm? That's a very low rpm to worry about valve float from low spring pressure.
Also, Schneider Cams (who did the regrinding) recommended 120/365 which does seem too low...

The valves in the new head are 11/32" stem, 2.14/1.81. They are probably even a bit lighter work

Also, why would it be only three valves out of 16, two intakes, one exhaust? shruggy