I may have to search for some of your other cylinder head upgrade posts. If I recall correctly you're moving to pushrods to make room for more porting? And I guess you're drilling out the holes in the heads to put bigger studs in the Box for more clamping force or am I mistaken about that that's just a wild guess by the way? Hey, your way out of my league here, Brother! I'm just trying to figure it out so I can wrap my, head around it! Lol