cooked it! What did I do wrong?

bohica2xo said

Was that AFR from a wideband in the car when it happened?

With a that piston @ +.060 you need chambers at least 90cc's to get close to where you should be. What was your combustion chamber volume?

92 octane pump gas can be all over the place as well. We are switching from summer to winter blend all over the country right now too.

If your spark was really close to the edge, and you got some 90 octane stuff, or some winter blend that lights a little faster...

Sorry to see any damage like that.

What does the plug look like?

B.

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I run a AEM uego so yes wideband. The pistons are a -30 dish. the heads are 78cc and I run a .062 copper headgasket. The pistons are in the hole a smidge.. the plugs are wet. cant remember what I have stated earlier on. but it blew a headgasket at some point. I dont know if this damage was before or after the HG blew. It didnt swap fluids just ate the water. Its totally possible that I made 6-10 more runs with it like this. The head shows some slight dings but they are all carboned over. I did drive it in the trailer and drov it in the garage.. I initially thought it was just the HG gasket..