The ATI crankshaft damper is a 7.48-inch lightweight aluminum balancer with a six-groove pattern, specified for LS1/LS2 front- and valve-body applications and featuring a 25-tooth 8mm HTD drive on the rear. Sized for the listed GM engines, it supplies the correct pulley interface and rear HTD drive detail for compatible installations.
ATI Damper - 7.48in - Alum LW - 6 Grv - LS1/LS2 - F & V Body - 25T 8mm HTD Drive On Rear