1977 Pontiac Sunbird Engine: 2.5L L4; Standard Rotation|Optional Non-Thermal Fan Clutch;. 1978 Pontiac Sunbird Engine: 2.5L L4; Standard Rotation|Optional Non-Thermal Fan Clutch;. 1978 Pontiac Sunbird Engine: 5.0L V8; Standard Rotation|Optional Non-Thermal Fan Clutch;.
