would a sharpe edge/point on a piston crown bring on Det ?
i checked the data logger and there was no afr/charge temp issues
and timing was mega safe, the piston valve cutouts had been remodelled due to a earlier valve / piston collison which mashed the pistons, now i have a dead head gasket which looks like det damage, and on that cylinder/piston there was a sharpe edge/overhang from where the cutouts had been dremmelled is that the possible cause for det?