by KE4AVB » Mon Sep 11, 2017 8:01 pm
Agree with creia on the leak down test.
Also depends how low the valve clearances are if valve replacement will resolve the problem. Only a couple ways to find out. I would try getting the valve clearance to spec and see if the compression comes up after reinstalling the head. Won't be prefect but would at least let you know if you're on the right track.
On valve replacement it depends how bad the seat is worn as to if the seat needs replacement too or just lapping but it sounds it will need replacing as they do round over. Just about as costly as the valve @ $51plus shipping . PN M43142 or 230265S. According the IPL I seen they are the same seat for intake and exhaust.
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