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Apparent and documented research in-house is showing that anything pre-1958 cannot be linked to DCOEs in motorsport.
1959 would seem a sensible year if to consider their introduction to the world of motorsport but this has yet to be properly documented, in accordance with the specific car and specification claimed.
Then comes 1960 and press articles such as Motorsport Magazine which in May 1960 does document the use of 45 DCOEs on the Lotus Formula 2 cars at the Bruxelles Grand Prix. Then in May 1960, when detailing the Aintree 200, Brabham on his Cooper did run 42 DCOEs. You will note that this was still so particular and new to the world of motorsport, that it needed a special mention.
Other than that, in 1959 the works Lola Mk1 was on SUs, then the Lotus XV was on DCO3s, in 1960 the works Lola Mk1 went to DCO3s still so it wasn't a change that spread across the whole spectrum. You may also consider that DCO3s and DCOEs needed specific and different intake manifolds in order to be mounted so not just a bolt-on change.
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