Part Type: Engine Cooling Fan Clutch. Manufacturer: Four Seasons. 1987 GMC G3500 Engine: 5.7L V8; Counter Clockwise; Optional Duty Thermal Fan Clutch; Fan Mounting Holes are 10 mm.;. 1987 GMC G3500 Engine: 4.3L V6; Counter Clockwise; Optional Duty Thermal Fan Clutch;.
