So what are the key differences in the head and engine that make them unable to be used correctly for drag racing? Also, what work is involved to change the engine over to a roller? With the ability to use epoxy, I would think you be able to get the port shape back to whatever you wanted. Also, one would be replacing most of the valvetrain anyway. Also, since there is less meat on the intake port side, has anyone thought of welding the top of the intake ports a certain amount, then re-machining spring seats and rocker stands, you would just longer pushrods after that correct? I figure you could get a .25 to .375 more height in the port.