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What is in the cooling system now? If it`s just mostly water it`s safer to add some antifreeze in rather than just draining water out in case you don`t quite get ALL the water out. There are NO frost plugs in a Flat Head engine.
If it has weak antifreeze good to at least minus 15-20 your good to go, it may jell but shouldn`t freeze.
it had just water in it and i took both bottom hoses off and drained them also took heater hoses off motor got no water out of them. but not sure if good to go as my garage has no heat
There should be dual plugs, shouldn't there be???
Also windshield water is better for old cast blocks then antifreeze, it displaces water.
Sorry wasn't hear earlier
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