Professional Products PowerForce Plus SFI 18.1 Harmonic Balancer - 6.700 in OD - Black - Internal Balance - Big Block Ford 20-225-4 making them compatible with the

making them compatible with the GM LSX block and all aftermarket iron or aluminum 6-bolt per cylinder LS race blocks

and nuts included

GM Fullsize Truck 2011-13

high RPM applications

Professional Products PowerForce Plus SFI 18.1 Harmonic Balancer - 6.700 in OD - Black - Internal Balance - Big Block Ford 20-225-4 making them compatible with theProduct Description: Harmonic Balancer PowerForce Plus 6. 700 in OD SFI 18. 1 Steel Black Internal Balance Big Block Ford Sold Individually The year was 1972, as newly imported automotive brands from Europe and Japan were gaining popularity; the founders of Professional Products entered the racing industry as part of Brock Racing Enterprises. The performance and styling parts company was an off shoot of the Datsun (Nissan) Racing Team. Prior to this,