These came on the "GFU" and "MPG" cars (USA-market B210 and B310 fuel economy champion models). F means Five-speed. G means optional engine. U means USA.
Cylinder head features:
- quench wedge chambers
- round 28mm (?) lowered ports
- Has round intake ports (like the A12 head). It has two small coolant holes below the intake ports, to provide heat for the intake manifold.
- Unique Thermostat housing
- Standard Datsun 1200 style cooling fan (not the larger typical A14 style)