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I had trouble with head gaskets on a 351W. The gaskets didn't leak any water into the engine and it ran fine because there was no leakage between cylinders. It ran OK at idle and slow speed cruising, but hit the highway and it would run out of water in a few miles.

After teardown and inspection it appeared that on the 2 rear cylinders, compression gases were blowing into the water jackets. This served to force water out of the system through the overflow. It probably didn't help that the heads had been milled way beyond what any reasonable person would have done!
 
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