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Q: coolant in oil on 2003 Chevrolet Malibu

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Just rebuilt engine- runs but rough shut it down.
coolant in oil
Heads were reconditioned, new gaskets, thermostat was replaced.
exhaust was light blue/steamy
Is this a cracked block or head
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Normally, this would point immediately to a head gasket leak. If that's not it, then it may be a problem with the heads or the block.
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