416 Burning oil and the road to redemption

RAMM said

The pistons are nice Ross forgings. I think I know what happened here. I think these are 4.060" rings and the bore actually measures 4.0715" for exactly .005" piston skirt clearance. Every .001" increase in bore opens ring gap up .003" (pi) So roughly .036" end gap plus the usual .018" gap a non-file fit ring set gives and we have .054". J.Rob

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This is why you have to verify everything.

If that is the case, that one is on the guy who did the assembly. It's possible that the rings were marked as .030 and were really .020 over, or they are .060 over 360 rings.

I've had everything you can think of come boxed wrong. If the guy doing the assembly actually verified end gap he would have caught it.

Luckily it wasn't the other way around.