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start it up, see if the upper hose gets pressurized before the engine gets up to operating temp. That would indicate a blown head gasket, or block/head cracked. when the block expands, compression goes out the crack. when the engine cools the crack shrinks, so no water flows into the cyinder. could be block or head.
has it overheated before??
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71 220D 169K wrecked
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68 280s GASSER!!! under construction now
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69 250S newest project 54K
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