Hmm, so I thought to check what information I have on the Archer vs Valentine engines.
According to the specs in the handbooks:
Valentine IX: "S" type, 130 BHP at 1850 RPM
"A" type, 165 at 1850
Fuel consumption(road): 2.5 MPG
Valentine X: 6-71A, 165 BHP, 2.5 MPG
Archer: 6-71M, 192 BHP at 1900 RPM, 2.9 MPG
More horsepower, and better fuel consumption. They must have done something to improve the engine, but I do not know what.
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