273 Commando Slugs

65Val, I needed a piston in my hand to understand. I believed too much of what I read about reversing pistons and thought you could do the hp pistons the same way. But no way. The trick started with B and RB wedge motors and they had flat tops from the factory. If you reverse the pistons on the rods and keep them in the same bore the domes would be on the wrong side of the chamber. If you switch sides the offset is the same just on the opposite bank.
Hard to explain and understand. Flat tops are easy. They have 4 valve reliefs so no matter which way you install them they work with the chamber shape and valve angle. Keep the rods in the same bore and twist the pistons to get rid of the offset. Mike