These balancers have 4340 grade Steel Inner Hub/Aluminum Outer Ring, for Street, Strip or Marine applications and include dual keyways. They feature dual keyways with a STD width (3/16 inch) with an additional 1/4 inch keyway 180 degrees opposite. Crankshafts manufactured without the 1/4 in keyway must be modified. All Blower balancers come with a larger seal boss diameter.
They are available in External or Neutral Balance configurations and there is a weight savings commensurate with the Steel/Aluminum units. The front inner hub face can be a standard factory layout or Romac's standard 6 Bolt pattern with a 2.000 inch register which suits standard blower pulleys. Romac Balancers are effective to 10,000 RPM.
