There are few better ways to learn about how certain car parts work than to actually watch them function, but some parts are hard to see. So here’s a video showing the innards of one bank of cylinders as the other does all the heavy lifting.

I know absolutely zero about this video other than what’s apparent in the video and what’s written in the title.

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The title says “Motor running without heads,” but clearly that title meant to say “head” (singular). Either that, or this thing is being turned over by a lightning-quick starter motor that sounds like an internal combustion engine, and the random person’s arm in the video is just pushing a throttle linkage for fun.

Either way, seeing the guts of this old flathead engine—the pistons and valves going up and down—is a thing of beauty.

What I want to know is why exactly this person has a bunch of engines on what looks like a flatbed trailer. What is this guy up to?