Chevrolet Small Block and Big Block features: Twin Key ways for secure crank mounting. Hub drilled for both 3 bolt factory pulley and 6 bolt Gilmer pulley. High preassure bonded dampening rubber for maximum torque resistance. SFI approved design Serpentine Balancer Design features: Some serpentine models 5% or 10% overdrive to increase supercharger boost. Twin Key ways for secure crank mounting. 8 rib serpentine drive for maximum belt grip. High preassure bonded dampening rubber for maximum torque resistance. SFI approved design

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