Have a SBC being rebuilt. Had a lot of blowby since I got it and burned oil and fouled plugs. Finally had it looked at and am told the oil control rings were shot, the middle rings were nearly as bad and the top rings were not too bad. Cylinder walls were affected/worn too. Engine actually had decent compression: 150 - 155 per cylinder (dry). The head's pressure tested A-OK.
Is it possible for just the top rings to hold that good a compression?
If fuel wash was the culprit (which seems to be the concensus), would all rings fall prey? I have a gentleman from Edelbrock tech adamantly telling me that fuel wash would wear out the compression rings, not the oil control rings. I have the shop telling me the oil control rings were the worst worn and that fuel wash will eventually wear out all rings.
Any logic as to why it took out the oil control rings so bad first?
Just looking for some other points of view.