I have a similar problem. Recently overheated a bit, and cylinder 7 and 8 showed 6:1 in CR versus 10.5:1 on all others. Tore the heads off, block and heads checked out for flatness. Bolted the pieces back together, used Fel-Pro composite gaskets and torqued to specs (55 to 75 to 110 pounds) and nothing. The compression is still off on the same cylinders. Any suggestions?
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