OK, this is a fairly long one. Last year I went to the dyno. Initially we set timing at 10 for base pull. Then went to 15. Made like 20-25 more hp until 4K RPM's, then detonation. Ended turning the timing down to 11. Every now and then I would get some light detonation with smoke when really getting on the gas, around 4K RPM's. OK, figured maybe I needed 24# injectors because evedentally I was running lean. I NEVER use cheap gas and before the injectors the FP was set at 44 lbs. wide open. Just put in 24# injectors. Turned FP down to 41lbs. wide open, drove to a buddy's place who has a meter to reset the TPS (had the intake, TB, ect. torn apart to polish when I did the injectors) and it seemed fine. No more detonation. Set the TPS at .98, then on the way home, one of the times I got on the gas hard, detonation--right at 4 grand! What the hell? Anyone got any ideas? Is that a bad setting for the TPS, or is it just coincidence. Is my FP way off with the new injectors? Could the balancer be off, giving me wrong timing indications? I hope not, cause I am hoping to be able to turn the timing back up to get those extra ponies back! Could my MSD 6al be messing up? What should I look for to check? The only thing I can think at this point is my cam is degreed wrong, and I am really hoping that is NOT it! It does not happen all the time, the car pulls REAL strong (probably good for mid-high 12's based on mods and dyno results), I don't even use good gas at cheap stations either. Only Exxon, Shell, or Sunoco 93 or up octane. The car does not run hot, and is going back to the dyno on Oct 12th. Very good cooling system mods. There is more done than what is in the sig, it won't let me add any more though. Any help would be appreciated!