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I swapped out motors and i started it and noticed a bad coolant leak behind the motor, its coming down good. I replaced the intake gaskets n nothing changed, i noticed antifreeze in the oil and the passenger side head has antifreeze on top under the valve covers, motor is a 350 vortec its leaking on the passenger side could this be a head gasket leaking internally, its coming down pretty fast down the back of the starter
 

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Sounds like head gasket/freeze plug/cracked head
 
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