Yeah the head of the bolt hits the manifold at an angle so it would dig in and not seal up. I didn't want to run it that way since there is fuel in the manifold and I don't want it leaking down the bolt hole into the crankcase.

To answer the earlier questions this manifold is MW port size and it only fits Indy heads on a RB block. I guess it might fit something like the new Victor heads but it is designed for the Indy heads with a valley cover.

The runner length is about 9 inches long so it is a little longer than a tunnel ram but not nearly as long as the Max Wedge cross ram. So the torque peak should be a little higher. Ken says it carries the power higher up the rpm range and that it makes more power than a cross ram and keeps making more the higher the speed goes. He figured it should be good for 50 hp on my 505.