It's a 7.3L V8 Engine for the Grand Marshal. I'm having trouble finding the mod cause I have around 200 mods installed. I also don't know if it came from an engine pack or what.
I epicsearch .in (added a space before .in so it doesn't make a link) Grand Marshall 7.3L V8 Engine and the 2nd link suggested https://www.beamng.com/resources/cjd-special-tunes.1583/