Street Series 6.87" Harmonic Balancer PB1021-ST Thermostats Many crankshafts are counterweighted to

Many crankshafts are counterweighted to offset simple balance forces detected at main bearings 1 and 5 by today’s precision balancers

AR207-5401

375 in (187 mm) Inside Width: 3

2 and/or 3 intake 60mm fuel pumps such as our AF49-1013 or Bosch 040 fuel pumps

Street Series 6.87" Harmonic Balancer PB1021-ST Thermostats Many crankshafts are counterweighted toStreet Series 6. 87" Harmonic BalancerSuit Ford 250 EFI 6 Cyl. 4 Bolt (Neutral Balance) PB1021 ST 1021 ST Street Performance All Powerbond Street series Balancers are manufactured from high strength SG iron which has far greater resistance to fatigue and cracking then grey iron. To save on cost some competitor balancers use regular "Grey" cast iron which has limited strength and is prone to cracking under extreme conditions, fatigue or even fitment.