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In an effort to appeal to smaller engine-building companies, USAC had permitted "stock-block" pushrod engines (generally defined as single non-OHC units fitted with two valves per cylinder actuated by pushrod and rocker arm).
His work to remedy high gasoline prices resulted in the first Weber carburetor, a "sidedraft, double-throat ... bolted to a Weber designed overhead-valve/supercharger conversion for the 501 Fiat".
The Evolution Big Twin motor is, for now, the last of the line of single cam, overhead valve motors tracing their lineage back to the ground breaking Knucklehead design penned by founder Bill Harley.
The engine was a development of the old 2.5-litre Standard pushrod unit converted from side valve to overhead valve with a new cylinder head designed by William Heynes and Harry Weslake.
Buyers could choose from a range of powerplants which included a choice of side or overhead valve engines from Ford, a Coventry Climax unit or the MGA B-series engine.
Settled in Manhattan, the two brothers set up Ardun (derived from Arkus and Duntov) which supplied parts to the military and manufactured aluminum overhead valve, hemispherical combustion chamber heads for the Flathead Ford V8 engine.