SBF 6.40in Balancer Ext. Balance 28.0oz

Pro Race Nodular Iron construction harmonic balancers. Balancers are manufactured from gray iron castings. Nodular iron is over 30% stronger than gray iron. Bonded Elastomer - Outer ring and inner hub are bonded (vulcanized) to the elastomer. This minimizes the potential for the outer ring to move on the hub, losing true TDC position. Removable Counterweights - Externally balanced models feature bolt-in counterweights, making it easy to switch from an externally balanced engine to an internally balanced engine. Precision Balanced - Balancers are machined and precision balanced. 60 degree permanent easy to read timing marks (40 degree on SB Ford models).