I am running VHM heads. I ran the 117 on domes cut for 117. I found the dent when I switched to domes cut for 92. So I just caught it in time because it got dented with 117. The one with the dent even had a crack on the inside just behind the lower ring half way around the piston. I understand lead lets you get away with more agressive set up but the rear still looks great which tells me its not and advance problem or they would both be cooked. the rear has 0 detanation marks on it.

I am running an 030 card with an HRC harness.
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1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike