[chiphead]

I wouldn't install it in a car without a rebuild. But just for grins, I once took a spare chevy inline 6 that was sitting on the ground, chocked it up with wood blocks and started it. I let it idle for a couple minutes to confirm it was good before I shut it off. I ran a garden hose through the heater connections to keep it cool. Don't revv it, as it will try to flop over. Another time, I helped a friend run a SBC 350 on an engine stand that he had added some bracing to. That was sketchy but it worked.

In your case, you'd need to know why it was stuck before you ran it. Running it with a broken ring or damaged bearing could ruin the block, if it threw parts.