How far are your pistons in the hole, cc's on piston valve reliefs, cc's on your heads, head gasket thickness? I bet you're more like 8.5 / 9 to 1 range. You should be around 165+ for 10 to 1
The Pistons are zero deck, and they are KB 107s, with I think 5cc valve reliefs. The heads are closed chamber 63cc heads with a 0.039 head gasket. Something doesn't quite seem right here... I know similar combos run mid 10:1s.
