10 thou you think?. I think your being quite pedantic here. Just cut the seat. I wouldn't be too worried about a little sinking on the exhaust valve on what sounds like a set of home ported heads with well used valves.
It's .050 thousanths with a 1.65 , and actually .025 being that we're talking about a circle.
I wouldn't mess with a 1.62 because its too close.
And home ported doesn't mean the heads flow for squat, so I'm not sure where you are going with this other than to say the op can't port correctly and he ruined his heads, is that what you are saying?
I'm not trying to teach people how to half *** stuff, I treat it like its mine.
My first set of home ported heads I did when I was 19 flowed 187 on the exhaust and 236 on the int., so u'd be surprised what a beginner can do.
Op, buy the 12-15 dollar 1.65 valve and go have the machine shop grind the seat for it and be done. It migh take a whole 2 minutes to blend it.
