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[91boz]

Replaced the rings and bearings on the 89 block and swapped with the 92. Dropped the engine in with a lot of struggling and cussing to get the rear engine mount to fit. Anyway after all of this was done I started her up and guess what, the same #3 cylinder was low in compression. I pulled the head and turned her over with the #3 valves closed and filled the combustion area with some Marvel Mystery oil and watched it slowly leak out of the exhaust port. One of the exhaust valves were not seating properly and leaking.
I just had the heads done in May and will drop it off today to see what happened. Both of these exhaust valves were replaced in May when the head was overhauled.
My old block was given to a friend who has a rod knock and he said that the #3 cylinder has broken oil control rings and the bottom 1" of the cylinder wall is scored. In my engine the only problem was low compression but no oil burning. I did have that cylinder filled with all sorts of chemicals MMO, Rislone, Seafoam etc to free the what I thought was sticky rings. It was only after pulling the head and checking the valves that I found out that it was the cause of the low compression. I don't know what happened the the #3 oil rings
Tomorrow I will help him pull out his engine and will almot certainly drop the lower crossmembers to gain easier removal of the rear engine mount.