Sorry CNC, I never dyno'd the combo. The engine shop I go to (Not to tout them too much) they build ARCA engines and all the top Late Model and Mod engines around here. The son ran UMP Mod and won several championships, and I picked his brain (very nice guys and very open with information). It was his idea to go this way with the bore and stroke. Everyone around here was building big cubic inch motors and blowing the tires off, while the top guys were building smaller cubic inches and reving them real high. He said that if he was to do it again, he would go somewhere in the middle, as the smaller engine struggled qualifying and when the track was tacky. So, with this combo, although I can't pull a 434 or 421 when its tacky, I hang right with them. When it slicks up real good on a typical Indiana summer night, I pull them around the track because I don't have a bunch of low end power to spin the tires of the corner, but it's literally a rocketship down the straight. It's the most awesome combo I've had.