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So from reading the article a 69 pace car without AC and with a 350 should have a 4 blade fan and not a clutch fan?
Are the blades on the original clutch fans steel or aluminum? Not the center hub but the blades.
5 blade Camaro fans have steel blades. The 4 blade fans don't really have "blades" - the unit is steel stamped in two parts and riveted together.
Unless the HD cooling option was ordered - there were a good number of SS350 cars that had a clutch fan.Check your radiator code before assuming...