1967 GMC G15/G1500 Van Engine: 4.1L L6; Standard Rotation|Non-Thermal Fan Clutch|w/o AC;. 1974 GMC G15/G1500 Van Engine: 4.1L L6; Standard Rotation|Non-Thermal Fan Clutch|w/o AC;. 1968 GMC G15/G1500 Van Engine: 4.1L L6; Standard Rotation|Non-Thermal Fan Clutch|w/o AC;.
