There is no issue with just getting it started without water. It will not hurt anything. Would I run it for minutes, NO, But 30 seconds, sure.
As far as why?
I wanted to make sure it would start as I chopped all the wiring and re-pinned most of the harness to clean it up. I also did it without my freshly painted fenders, nose and hood installed so I’m not leaning across all of it to fix anything that goes wrong. I also checked the alternator for charging and made sure all the gauges worked. All before adding water or the front end sheet metal. Once all of this checked out, I installed the radiator support, radiator, condenser, intercooler and fans. At this time I vacuumed the Ac to check for leaks and cycled the fans. THEN I put antifreeze in and checked for leaks. And last but not least hung the front end sheet metal.
This is my standard practice, it works for me.
Stan
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