At this point, the cam has been installed in the block. The LS9 cam is actually less aggressive than the LS7's. "With a charged engine forcing air in, you can run a little less cam," explained Guard. "Whenever you can make combustion more efficient in non-boosted situations, the base calibration is better." The block is similar to the LS3 block (6.2L) with the addition of oil squirters. These squirters direct cooling oil at the underside of the pistons, and are critical to helping the LS9 handle the increased temperatures that come with supercharging. The LS9 block is also deck plate bored and honed.