What is the main differences between an LY6 and an LS3 ?? LY6 = 6.0L with VVT, 9.6:1 Iron Block, Aluminum pistons, Powder rods LS3 = 6.2L no VVT, 10.5:1 Aluminum Block, cast hypereutectic aluminum/silicon alloy pistons, forged powder rods. I've seen 2 versions of LY6's out there. Van and Truck. Van = 323hp Truck = 352hp LS3 in the Corvette = 430hp You're talking nearly a 100hp difference from the Van LY6 to the Vette LS3. So what gives?? Is it just a tune between the factory Van and Truck motors? Also some guy was trying to say with an LS3 intake, injectors, and tune the LY6 puts down just about the same HP as the LS3. With all the differences I just can't see it being the same without sacrificing efficiency. Thoughts??