[1] In the contest it developed 103.5 hp (77.2 kW) at 1,370 rpm while weighing 205.55 kg (453 lb).

There were two overhead valves per cylinder, which were operated via pushrods and rocker arms from the camshaft on the left side of the engine.

The intake valves were oriented to the center of each cylinder pair, and their intake ducts were conjoined within the casting into a single external port facing to the left side of the engine.

The centrifugal water pump was relocated from the left to the right side of the engine, where it was driven from the crankshaft via spur gears, with the magneto driven from the same layshaft.

While the engine had two spark plugs per cylinder, it still had just a single magneto, with the lack of an independent second magneto on Argus' contemporary engines being criticized in reports for the prize contest.