Thread: 1978 v20 Mercruiser 470 possible replacement needed please advise
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Unread 05-04-2012, 06:24 PM
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Join Date: Oct 2006
Location: Raleigh, NC
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do a compression test and report back, make sure you have the spark plug wires in the correct order. Its unusual for it to drop two cylinders like that unless it has a blown head gasket.
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