The Rolls Royce Merlin.
The most useful aircraft engine of all?
https://en.wikipedia.org/wiki/Rolls-Royce_Merlin#Applications
And it was used as a tank engine in the Cromwell, Comet, Centurion, and Tortoise.
Trust me. I know what I'm doing.
After the war many Merlins (Prolly Packard) were used for boat racing and other motor sports in the US. They were run hard and many just expired (Mech Heaven)
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