My timing belt went out as some of you may remember, well the valves did smash into the pisons and it left a dent on 2 pisons. Is it possible to grind the head of the piston down so that i dont have to replace them, or am i up shit creek without a paddle. 4 valves got bent in the process, i know, it sux!!!!

usually that can only be told from the bottom though, i thought?

Judging from your member picture, they look good enough to run again. You may want to sand the edges of the dents to prevent detonation from the sharp edges and stress risers.