The Allstar block mount GM LS gear reduction mini starter works with 168 tooth flywheels and provides increased starting performance over OE style starters. This high quality starter features a 3-position mounting block which allows the starter motor to be rotated for additional clearance around exhaust and frame obstructions. A high torque 3HP motor combined with 3.75:1 gear reduction is ideal for engines with up to 11:1 compression ratio.