Note that, prior to its merger with Prince, Nissan also made a G series of engines.

[1] Prince developed the FG4C, a flat-four displacing 599 cc and producing 38 hp (39 PS), as a replacement for the FG2D.

This undersquare arrangement was similar to the designs Nissan licensed from Austin Motor Company, though this is probably coincidental.

This engine was also an OHV design and power output was similar to the Nissan G at 73 hp (54 kW; 74 PS) and 12 kg⋅m (118 N⋅m; 87 lb⋅ft).

Bore and stroke were square at 84 mm (3.31 in), and output was 96 hp (72 kW; 97 PS) and 15.7 kg⋅m (154 N⋅m; 114 lb⋅ft) with a 2 barrel carburetor.

It was an improved version of the GB-4 and was introduced in 1962 and was installed in the S40 series Prince Gloria as well as the Clipper and Super Miler commercial vehicles.

With a crossflow cylinder head, a V-shaped canted valve arrangement and a multi-spherical combustion chamber design, the G-15 was the most technologically advanced Japanese car engine of its day, eclipsing even Nissan's L series engine in their design.

It was an SOHC cross flow cylinder head design like the G-15 and produced 105 hp (78 kW; 106 PS) and 15.9 kg⋅m (156 N⋅m; 115 lb⋅ft).

Engine displacement was kept below 2000cc to limit the amount of Road tax to be paid yearly in addition to other Japanese Government mandated expenses.

Bore and stroke were square at 75 mm (2.95 in) and power output varied with the carburetor equipped.