I had a Buick 455 that always overheated. No matter what I tried didn't help. Root cause of the problem was the rotating assembly was tight, like it wasn't as loose as it should be. It created alot of internal friction = heat. Thats when I learned that the internal engine assembly is important for running cooler. This 455 in my 72 T/A, with cam, etc. will run cool allday. I can let it idle for a 1/2 hour still runs around 180. This motor was built by Nunzi about 5 years ago, 25K miles on it.
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