Carnut1 wrote: The valve job for the sunk port #1 2.08" 40 / 45 / 60 / 75. Thanks, Charlie
Those seat angles should work well if your staying 45* seat. I'd want the top angle (40*) to show all the way around the valve.
And, I'd stay with a 2.08" valve in that head and 45* seat choice.
It takes .200"-250" to make a good transition through the throat and out through the window.
.225" less than 2.08" will give you a throat CSA of 2.61" with stem area removed. That's already bigger than your MCSA.
Staying a little conservative on port size, valve size, cam size, intake size, has always been the better running stuff from what I've seen.
And I disagree that sinking valves hurts flow, at least high lift flow.
I'm the process of re doing the valve job on heads that had new guides put in. They are sunk some more getting the angles all back, and every one of them has picked up high lift flow from before, 10cfm average, but the usual trade off, it's adding cc to the chambers. That will require milling to reduce cc, which may hurt air flow some.
But in general I agree with Knight, it's when you get into the top angle that hurts flow, that's why angle mill only. It disturbs the seat angles less.