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Freeze plugs are there to get the sand out when the block is cast, I've heard tales of them pushing out when a block freezes but I've actually seen blocks crack and the freeze plugs stay intact. Is your block cracked or what?
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86 F350 2WD Duallie dump. 351W edelbrock cam, carb, d/p intake,C6, D0OE heads. 4.10 gears
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