Clutch Fan: Corvette BB W/AC 70-74 + Various GMFor the higher performance requirements of big block GM V8's.. this is the clutch fan for BB AC cars where a factory fitted clutch fan is still usable. Bolt Nut Type 5 16 18 HOLE (4) Fan Bolt Cir 3. 25 Flange Cir 2. 59 Fan Mount Dia 2. 62 Fan Mount Height 1. 62 Overall Height (H) 3. 19 Overall Diameter 7. 20 Pilot Diameter 0. 75 Pilot Depth 0. 63 Rotation STD
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