Professional Products PowerForce Plus Lightweight SFI 18.1 Harmonic Balancer - 6.000 in OD - Black - Internal Balance - Small Block Chevy MTL109055-12 They are not compatible with

They are not compatible with NPT

and have taken note of some suggestions from over the years to make a great product even better

250-500 HP

Mini 2001-06

Professional Products PowerForce Plus Lightweight SFI 18.1 Harmonic Balancer - 6.000 in OD - Black - Internal Balance - Small Block Chevy MTL109055-12 They are not compatible withProduct Description: Harmonic Balancer PowerForce Plus Lightweight 6. 000 in OD SFI 18. 1 Steel Black Internal Balance Small Block Chevy 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.