Clutch Fan: Corvette SB 74-80 + Various GMFor the higher performance requirements of small block GM V8's.. 74 80 this is the Heavy Duty clutch fan for Corvettes 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. 56 Fan Mount Dia 2. 62 Fan Mount Height 1. 80 Overall Height (H) 3. 51 Overall Diameter 7. 20 Pilot Diameter 0. 75 Pilot Depth 0. 63 Rotation STD
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