Quote:
Originally Posted by robertwb70
If you're not into high RPM performance then 30 degree valve seats could show measurable improvement. (you can still have the 3 angles, just the seat/ contact point is 30 instead of 45)
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"Could" being the key word, as my understanding of it is that strategy can't be universally applied; some port/valve/chambers work better with 30 and some work better with 45. I personally wouldn't change any of my heads from one to the other unless there was an impressive body of work by accomplished cyl head guys that proves it to be a good move for my application.