The ATI crankshaft damper is a 5.67-inch aluminum balancer with a 6/4 groove arrangement and 25 percent underdrive, configured for LS1/LS2 front- and valve-body applications and listed with 10 teeth per underdrive A/C provisions. As a one-piece damper, it matches the stated diameter and groove spacing for direct-fit replacement where those LS configurations are used.
ATI Damper - 5.67in - Alum - 6/4 Grv - 25 Percent UD - LS1/LS2 - F & V Body - 10 Per UD A/C - 1Pc