How long can I run an LS1 without water
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Are you just trying to check out the engine before you buy or something like that? I dont see it being much of a problem to run it for maybe up to a minute. Shouldnt heat up that quick. I would keep it to a minimum though. Run it just long enough to listen for bad engine sounds and check for smoking out of the exhaust. I personally would keep it under 30 seconds just to make sure I didnt damage it. It would be a shame to test it and decide to buy it, only to find out that you hurt it in the process. Dont take the chance of warping the heads or something. If the engine is still in the car and the radiator is still hooked up, take a few old milk jugs full of regular water to put in it just for testing purposes and drain it later.