I know this is more of a car issue than a tractor issue, but I bought a 78 dodge ramcharger some time back with headers, and I had a heat issue under the good leading to vapor lock. I decided on wrapping the headers after talking to a number of people. The wrapping lessened the vapor lock problem, but after 1 year the headers disintegrated from rusting out as the wrapping trapped water and road salt. I ended up buying new headers that were ceramic coated, which solved both problems. Wish I had done that in the first place, but live and learn!
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Ian
Mine: 72 w/ k301, 3 125's, 1 w/ hydro lift, 38,42, & 2 48 decks, 2 42 front blades, QA-36a & QA-42a thrower, tiller, lo-boy 154. Also, LOTS of parts.
family's:2 105's, 2 106's, 149, 2 lo-boy 154s, Farmall Cub.
Non-IH: 1940 JD Model A, 1954 JD 40 U, 1955 JD 40 Crawler, 2 1956 JD 420 U's, both w/ Henry Loader and Backhoe. JD 110. Wheel Horse (model unknown.) Power King 1614. We love our tractors! 
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