Hello, Does anyone recognize the following description of a short story title? It would have been published prior to 1968. I haven't had any success searching. 

A mechanic was drafted in WWII and became the driver for the commanding officer. The commanding officer was called away and the mechanic saw the opportunity to replace the underpowered four cylinder engine with a more powerful V-8 from the salvage yard. The more powerful engine saved the life of the commanding officer during battle.

I appreciate any suggestions.  

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