Quote: What do the rest of them look like? That is some pretty serious abuse there that might show up in more than 1 hole.
The others all have some carbon buildup on the tops (as this one does), but none of them show any signs of being cracked or broken. I suspect some of the oil rings may also be bad. When I had the motor tilted on its side on the engine stand, oil was leaking down past a few of the pistons (or maybe that's just where the oil control ring gaps were in those cylinders?).
In any case, I've decided to hold off doing anything until I investigate other possibilities (namely, looking for another motor).
Rings have gaps so if you put oil against them the oil will eventually find it's way out ... gravity ...
