Thread: I need some 383 stroker help, Please!!!

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From what I saw I'd say those rings killed your pistons. The spot right where the ring ends are is where the piston broke, if you didnt move the ring around then it sure does look suspicious. It seems to look like they butted and busted the top off. 0.025 is quite a bit even with those Silvo-lite. I used them once and ironically my engine was destroyed so I swapped to forged and I didn't look back. Problem with the engine was an exhaust valve seat (hardened because they were old '68 186 castings) came out and shattered on the no. 1 piston and then reverted through the bottom intake runner and dropped another 3 pistons. Ok, back to reality, I assume you are measuring them correctly so whats the deal I wonder. I don't see detonation being a problem from those pistons. Is there something you maybe overlooked, like the other rings, the proper piston fit, deck height. I doubt that you would have overlooked stuff like this on the 3rd time through but I can't really see why this would happen unless the rings were filed incorrectly or with a large variance which would hardly explain why only one piston goes at a time because that could be a time thing too among other things, different heats etc. Are you getting suitable cooling to all the cylinders? Proper cylinder oiling? What type of rings are these? I don't mean to insult I am just brainstorming possibilities.

EDIT: Also, Richard I was thinking of something 'else' the other day when I posted about the compression psi going up but the ratio down. With more air yes the psi would go up, but the ratio would also slightly raise because of the extra volume. However, if the chamber was to decrease by even 1 cc when the cylinder was bored another .010 this could create less ratio than if the bore was .010 less with a one cc smaller chamber. Whatever, its small numbers with small variables and variances, but on the general increasing the bore, while maintaining all other things that determine the ratio, would increase the comp. ratio slightly.