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The radiator shop I used growing up would unsolder the tanks and use flat rods to rod the radiator tubes out. I bought a '70 428 Mach I new that always ran hot. When stopped at a light or a train crossing, the dual vacuum advance/retard would run the idle up to 2000 RPM. Finally after a summer run from Louisiana back to the Texas Panhandle, it started blowing steam out of the top tank seam. I took it to Alvin's Radiator to have it repaired, and he said he found 1/3 of the tubes plugged with some strange stuff he had never seen before. He thought the stuff had probably been in there from day one. After he rodded the radiator and reassembled it, that car never overheated again. Running that hot did, however, cause the nylon teeth covering on the timing gears to eventually disintegrate. Luckily the engine wouldn't run, so it didn't plug up the oil pump intake.

That does not compute