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Q:

CAN CRACKED HEAD BE WELDED 1990 325I CAN ANOTHER YEAR MODEL HEAD BE USED on 1990 BMW 325i

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HEAD IS CRACKED
(1) Answer
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It is not recommended a head be welded if there is indeed a crack, depending on your financial situation. M20 and M30 have a slightly different head from memory, contact your nearest wrecking yard. Once a used head is acquired, have it pressure checked, valve stems check and seal replaced, decked is necessary.