I meant not to upset anyone and I'm sure you know more about Mustangs than I do but I grew up in the muscle car era and running without a radiator cap on those high compressoin motors for a couple of blocks would cause the cooling system to belch out everything in it. But, I shan't argue. I would imagine you're right on about pulling the heads. Blown head gaskets can air up a radiator in a hurry. I'm curious to see what you find.
Good luck.
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Father to two Teenage boys and three Mustangs. 71 Mach 1, 85 LX trunk, and one '89 GT
Someday. . . It's gonna be Dad's turn to build one.
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