cooked it! What did I do wrong?

Your compression isn't an issue with such low boost and 92 octane. I've found 15lbs boost on a 9.2 compression motor to be the safe limit on 93 octane.
It wouldn't hurt to be running a meth/water setup though since you could always get some questionable fuel. If you want more info on that PM me.

It sounds like your timing was too high and/or you got some lower octane fuel and detonation got the better of you. Lifted a head, blew a headgasket, and cooked a piston.


fwiw- Been there..it sucked 22lbs boost, 93 octane + water meth injection. Found out water/meth is best left to 18lbs. After that I only used race fuel for anything more than 18. The meth helps but it doesn't mix with the 93 to make all the fuel higher octane. It just makes a higher average.
Yep that looks alot like mine. I'll take any info and tips you want to share. I do want to do a h2o set up on it. Just thought I would have been ok with where I was at.. guess not..