ATI Performance Products Drill Fixture, Crank Pin Drill Fixture for LS1, LS2, LS3, LS6 AND LS7 Steel, 1.438 in. I.D., 11/64 in. Drill Bit, For Chevrol (ATI918993)LS1 CRANK PIN DRILL FIXTURE SuitGM LS1, LS2, LS3, LS6 & LS7 Part Number: ATI918993 ATI's Crank Pin Drill Fixture Kit for the LS1, 2, 3,6 and 7 along with Hemi Super Dampers allows you to install 1 or 2 dowel pins to the LS orHemi crank, eliminating the damper twist on the shaft. In most applications, the crank may be drilled and the pin installed with the engine in the vehicle. This is a must for engines used in circle track racing or supercharging!