Abstract: An anti-rotation bracket for an internal combustion engine, including a peripheral wall having formed therein four outer apertures formed proximate to four corners of the bracket and a groove formed in a lower surface of the bracket, the groove forming a contiguous depression around the lower surface of the bracket and passing between each outer bolt aperture and a center of the bracket. The bracket further includes two tappet structures comprising tappet apertures, the tappet structures being centered inward from the peripheral wall, and an inner aperture positioned inward from the peripheral wall.