Some one earlier stated bore was king, I agree we run a spread bore wedge 600-13x motor. Originally it was 4.563 x 5.00 we changed to 4.600 x 4.75 and went 3tenths faster. We can't compare dyno numbers due to a change in dyno's. Our wedge motor on Best"s dyno is at least as good as any Predator motor they have built, and I think better. We are 4.840 bore space.