Quote:
Originally Posted by BeyGon
can a rod/main bearing get that bad?
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Yes...
Many, many variables in Chevrolet engines for displacement, head design, stroke, compression, etc. But I did have one that I killed many years ago that threw out this type of warning sign before the worn bottom end made a brilliant connection with the valves in one cylinder hard enough to shove the pushrods and lifters for one cylinder into the crank case. Well into...around...etc. Same cylinder that had the "odd" damaged spark plug previously. The engine autopsy revealed a horribly worn crank with the bearing entirely missing for that connecting rod. Almost a half of an inch of play on the connecting rod interface with the crank.
Though in this case, if you hear hoofbeats, think horses not zebras. More likely something was in the cylinder bouncing about and is either fabulously embedded in the piston or has worked its way out of the exhaust.
angela