Greg what are you using for "water?"
My old (RIP) engineering friend from San Diego, when I first met him, had a then brand new 70 Chev K2500. Over the course of our friendship, that truck got a new timing set and bigger cam and I've forgotten what else. In any Case Gary was a pretty smart guy, and unlike "most" San Diegans, did NOT use tap water in the system. Antifreeze and store-bought "pure" (insert your word) water. And that radiator and engine internals literally looked like new years later. I've forgotten, I think he kept that truck nearly 15 years when living, later, in AZ (General Dynamics)
