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This is a replacement fan clutch for 1960-1970 Corvettes. Includes two 5/16" hubs. Thermostatic fan clutch "locks up” as temperatures rise in the engine compartment. Does not have the original-style thermostat; since this is a replacement clutch assembly, it features a "coil" style thermostat.
Note: This fan clutch is designed to use coarse threads for the fan blade mounting studs. The original fine thread studs will not work for the installation. Order 243156 for the coarse-thread studs to complete the installation.