I know you crossflow wizards out there have done this mod in the block(s). I have ported a 150 and it makes whatever hp it does. The midrange pull is amazing. What performance gains are to be had by opening up the cylinder below the piston(into the inspection covers) and installing the 2.6gt pistons? What is the advantage of it? or should I say, why is it done?

By the way, anyone got any 872/873 heads?