12-rib crank pulley stock Dia. 7.950 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 - 69.9" / 12PK1750
• Magnuson Hot Rod with 3.00 Upper Pulley - 77.2 Continental - 4120772
• Whipple WK-1810 (JD) with 4.00 Upper Pulley - 75.8" / 12PK1925
• Whipple WK-1810 (JD) with 3.00 Upper Pulley - 74.00" / Continental 4120740