Professional Products PowerForce Plus SFI 18.1 Harmonic Balancer - 6.400 in OD - Black - 28 oz External Balance - Small Block Ford AA0810AF2X61 Multiple USM modules may be Size:X-Large (58-60)

Professional Products PowerForce Plus SFI 18.1 Harmonic Balancer 6.400 in OD Black 28 oz External Balance Small Block Ford AA0810AF2X61 Multiple USM modules may be Size:X Large (58 60) Multiple USM modules may be utilized on one system if desired 5 amp single spark through high rpmEasy to adjust mechanical advance with supplied springs and stop bushingsVacuum advance canister for improved economy (can be locked out)CNC machined billet aluminum housing and billet aluminum base for long life and great looksMaintenance free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangePolished steel shaft is QPQ coated and guided by a sealed ball bearing providing smooth operationAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionMechanical advance assembly can be locked out for crank trigger systemsAdvance weight pins are staked and tig welded to the plate for superior strength the team set about designing products to turn street pony cars into performance cars The year was 1972