Notes: Standard Rotation; Optional Heavy Duty Thermal Fan Clutch; OE Fan Clutch Height. Part Type: Engine Cooling Fan Clutch. Standard Rotation Thermal Heavy Duty Fan Clutch. Fan Clutch. 1974 Chevrolet G10 Van Engine: 5.7L V8; Standard Rotation; Optional Heavy Duty Thermal Fan Clutch; OE Fan Clutch Height;.