Metalman, Dwayne Porter ran the dyno test as well porting the heads. The fastest Mph the car ran was 136. I had also talked with Dwayne about going to max wedge port window but, as was previously stated, the effort is not worth the gain. I was happy with the B1/BS heads over my old ported 906's however, they are limited to how much you can get out of them. I had the same issues with oil all over the place when removing the valve covers, a real pleasure when adjusting valves! Also, what a treat changing spark plugs. The easiest way I found was to plan on dropping the headers every time!