Watch the exhaust manifolds on a 454 Chevy engine in a motorhome on a long uphill pull. They get red hot, and those are cast iron, not thinwall steel tubing. That's well over 1000 degrees, probably closer to 1500. I've made several test runs with different motorhomes with the engine cover off, trying to diagnose detonation noises that were causing cracked spark plug insulators and burned valves. A stovebolt engine will probably do something similar pulling a hill at close to maximum gross weight. A Cowboy Cadillac that never does anything more stressful than hauling an iced-down Yeti cooler full of beer to a tailgate party, not so much!
Jerry
