FWIW, on my Regular, I had zero compression on the guage, and could just feel a slight puff with my thumb on the plug holes. Pulled the head and the valves were toast. Fortunately, the seats weren't too bad. Picked up some good used valves, put a fresh face on the, and just did the seats today. Will lapp them tomorrow, and will probably put the head back on this coming weekend.
I fully expect to have good compression when I do. There was barely a ridge on the sleeves, and they look to me like the old girl got new pistons and sleeves at one point in her life, and not run much after that. Takes a day for 1/4 - 1/2 cup of PB blaster to leak down through the rings. IF I have the head off an engine, I like to pour PB blaster in and soak into the rings while working on the head. I even do that if all I am doing is replacing the head gasket . Doesn't hurt these old girls to loosen up the rings if they have been sitting awhile.
This post was edited by Tom Fleming at 01:51:26 09/12/11.
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