whacked Piston ?

6.0 @ .30 over, Isky mild cam, LS1 heads., LS6 Springs, custom dyno tune...now this on Cylinder # 7. Any ideas on a cause?

This all replaced stock 03 5.3

Thanks guys..

Good ole #7

Detonation? #7 is prone fuel starvation.

or excessive heat.... reasons are not 100% sure