1961 GMC 1500 Series Engine: 5.0L V6; Standard Rotation|Standard Duty Thermal Fan Clutch;. 1965 GMC 1500 Series Engine: 3.8L L6; Standard Rotation|Standard Duty Thermal Fan Clutch;. 1965 GMC 1500 Series Engine: 5.0L V6; Standard Rotation|Standard Duty Thermal Fan Clutch;.
