Holy crap bro! This is turning into a bigger and bigger "woops" as the days progress. If I were you I'd be loosing my mind by now.
But I'll answer your question with another question: how deep (roughly) is the groove? Is it around 1mm or less? Pics would help us juge this a little better. Hopefully that impact didn't result in a fractured piston sleeve or even worse - a damaged crank journal.
I don't remember your setup quite that well, did you use forged or cast pistons?
3 pistons. its only a little. like 1/16th of an inch. i dont have a camera good enough to actually help you guys on this one. stock pistons, engine was rebuild right before i bought, so i dont know if that includes new pistons
ok thanks, my mechanic said the same. alomost killed myself!!!!!!!! lol, well i got some one to replace my valves. 40 bucks for all 3. just waithing for the valves to get here now. thanks guys!!