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Old 05-15-2023, 08:17 AM   #122
clay68c10
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Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,905
Re: Sullii the 72 GMC 1500

Nice progress. It's great to know that all the electrical mods are functioning.

Just fire it and see what happens. Mine was very similar. It sat with Kroil in the cylinders for about a year after I tested it. I finally fired it up and it's running just fine idling in the garage. That may be different once it's under load, but that's a problem for future me.
It was pretty rough for the first minute of so, then evened out. That may have been the rings un-sticking or the injectors clearing out, but either way it smoothed out and appears to be ok now. These engines are known for gumming up the rings and I suspect that's what you (and I) are seeing.
I haven't re-tested it, but I probably should. Maybe this summer.
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