So my tuner, members on the evo forums and myself are trying to find the cause of this...
Our conclusion thus far is i got some detonation/knock which caused the piece of the #1 piston to break off, which got caught in the intake valve. Which caused to not close correctly and ripped it apart.
I ran on 94 octane from huskeys for the first half of my tuning. Once my clutch **** the bed and i was waiting for the new one to arrive, i tried 94 from petro canada. Like my earlier post. I never had any knock on 94 from huskeys but got a few on petro canada. None the less i decided to stick with petro for the fact that its closer to my house and they offer the petro points. I was hoping my tuner could just lower the timing or something to get rid of the knock. However before he could, the engine popped.
Was Petro Canada gas responsible for this? who knows. But i have logs to back up my findings that Huskeys didnt give me any knock but petro did. So just be aware of what gas you guys use. My car will probably be down for the next year, defently wont be done by the end of the summer and i wont be taking it out in the winter after a rebuild since i have to do tuning and dont want to do it during the cold temps. So when the car is build (most likely to a 2.3 stroker) ill be running 94 from huskeys + meth.