I did it to my 78 F-250. I used a 1 liter soda bottle and poured it in as fast as it would flow, although I had to run the engine at learly wide open.

Immediately after I squirted oil down the carb to restore the oil film on the cylinder walls.

I got enough black stuff out of the exhaust to fill a coffee can

"careful man, there's a beverage here."
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