Reply to "4V CC head porting with pressed bronze valve guides."

rockyMember

quote:
And one big question I have, I have new EPN stanless steel valves, which seat cut should I do ? I was think about a classic 3 cuts 60/45/30, this is the next step for my heads after having ported and pressed the guides.

There was an interesting article in Popular Hot Rodding (a pretty good mag, back in the day) saying that a steeper valve seat (50 Deg, vs. 45 Deg or 35 Deg) resulted in a dyno'ed Torque and Horsepower improvement. The peak torque moved up in RPM, and the Peak HP moved down in RPM.

See if you can find it in the March 2012 issue or Popular Hot Rodding.

Interesting article. The test engine was a Chevy Vortec.

9/13/153:46 PM

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