by Onex107 » Wed Apr 26, 2023 12:22 pm
If you are doing the 80 psi leak down test, run the engine before, and do it as hot as you can. It does make a difference. All it takes is a small piece of carbon to make them leak. You didn't say what the pressures were. I didn't do it until the pressures were in the low 60's. When I lap the valves, I don't take them out of the head, I chuck a drill on the end of the valve stem and put some lapping compound on the seat and run the drill both ways while pulling on the drill. It may be unconventional, but it works.
OneX 107
N2107X