translates into parasitic horsepower loss because it resists piston motion. With the windows, the air is allowed to move more freely between the crankcase bays, thus relieving the unwanted pressure.
New Pistons
    Cast from high-strength M142 aluminum alloy, the LS6 pistons are reshaped with a slightly different profile from those in the LS1. In a side view, the LS6 pistons have a slight barrel shape, which is almost imperceptible to the naked eye. The new alloy increases engine durability during racing activities, while the shape reduces internal mechanical noise.