[Licensed to kill]

Originally Posted by dpson

Yes, this was in a chassis that I bought and the radiator has a good size hole in it. I wanted to see if the engine would run, so I started it and ran it for a short period. Far less than a minute, but wasn't sure how long was safe if I want to do some fine tuning adjustement. Sounds like it's best to fill the cooling system, even if it leaks, to run it.

If that is what you are doing, fill the rad and leave the garden hose in and running letting the excess run out the top and the hole in the rad then run it as long as you like.