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The 3.7 L (3670 cc/223 in³) engine, designed by Tadek Marek, was a double overhead cam straight-6, with cylinder head and block of cast R.R.50 aluminium alloy.
In the same year, Thomas Henry Barton (who later founded Barton Transport) at Hornsbys built a working high-compression version for experimental purposes, whereby the vaporiser was replaced with a cylinder head, therefore not relying on air being preheated, but by combustion through higher compression ratios.
:Southeastern 500 Maurice Petty finally diagnosed the team's overheating issues as a cylinder head issue; with the issue corrected Richard Petty won his first race at Bristol International Speedway since 1967.
The shape of the combustion chamber as an "inverted hemi-head", along with the angled cylinder head joint and pitched-roof piston crowns, had earlier been used in the 1930 Van Ranst-designed Packard V12 engine, although in this case the valves were both in the block as side valves and the spark plug was poorly placed at the extremity of the combustion chamber.
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.
Curtiss and air-cooled Renault engines even used an X-shaped cap above the outside of the cylinder head, with the studs bolted though that so as to distribute the forces evenly across the head.
The cylinder head has hemispherical combustion chambers similar to that first used by Peugeot on their 1912 Grand Prix car and subsequently refined by Vittorio Jano in 1920s and 30's, as well as by Walter Hassan in 1940s and 50's, among other notable engineers who continually borrowed ideas from the aeronautics industry.
Monobloc engine: an internal combustion engine with the cylinder head and block formed as one unit.
It used Lucas Electronic Unit Injection, instead of the L-Series' direct injection system, as well as a through-flow cylinder head and a very different ancillary equipment layout.