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21106 1" Mandrel goes to Chevy BB Balancer 5" Overall Shaft is 4" 1/8th" keyway
3.147" FROM OUTSIDE TO OUTSIDE OF HOLES IN BOLT PATTERN
Utilizing aerospace tolerances and procedures, three generations of track experience, and a meticulous
approach to engineering, Aeromotive Fuel Systems has become the absolute pinnacle of performance fuel delivery.
1" Mandrel shaft with 1/8 th " keyway 5" overall 4" Shaft our 1" pulleys ALL fit it also IW-947 similar WITH SPACERS