1979 GMC K3500 Engine: 5.7L V8; Standard Rotation|Standard Duty Thermal Fan Clutch|w/ Std Duty Fan Clutch;. 1980 GMC K3500 Engine: 5.7L V8; Standard Rotation|Standard Duty Thermal Fan Clutch|w/ Std Duty Fan Clutch;.
This product is ideal for GMC K3500 5.7L V8 engine upgrades from 1979 to 1982, particularly 1980 and 1981 models.
