That looks vaguely like a panel I saw piles of at Princess Auto Winnipeg in the 1970’s. I think at the time they were supposed to have come from radial engine equipped Sherman tanks.
The warning about hitting the gas on start up was to prevent a misfire that could apparently shear the crankshaft.
Been a very long time though so I am not sure.
David
PS: let us know for sure if you find out.
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