12-rib crank pulley stock Dia. 10.00 designed for the LSA Offset with 12 Rib.

Bolt's to aftermarket harmonic damper's supporting both 3 bolt pulleys using the classic SBC/BBC bolt pattern such as the ATI 918854 and ATI 918859 LSA Damper.

Flex Drive Belts 

• LSA/KONG 3.25 trough 2.625 Upper - 72.00" / Continental 4120720
• Magnuson Hot Rod with 3.00 Upper Pulley - 81.5" / Continental 4120815
• Whipple WK-1810 (JD) with 3.00 Upper Pulley - 77.2" / Continental 4120772