Original sentence: The engine produced from 170 hp (DIN) with Zenith-Stromberg carburettors, to  hp (claimed) with the triple SU HD8 carburettors
Edited sentence: The version of the engine fitted with Zenith-Stromberg carburettors produced 170 hp DIN, whereas the triple SU HD8 carburettor version was rated at  gross (the difference in the measurement systems being significant)