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If you go the pistons out without damage, that ring rigde can't be very large (the rings will stick otherwise, and break going past it). I've seen then 0.035" deep!
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I think I shouldn't have said 'ridge', I should have said 'trough'. There is a ridge of carbon, yes, but immediately below that, one quarter inch all the way around, is a trough where the reading is beyond limits. The rest of the cylinder is acceptable.
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Stuck oil rings (or overheating the engine and annealing the springs behind the oil ring) can cause large amounts of oil to get "pumped" into the combustion chamber.
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Ping! That might explain a few things. Thanks for the other tips too Peter. I'll let you know what happens.