Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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i would think your problem is blown head gaskets,,replace both and have the heads checked for cracks..
i wouldnt think the heads are cracked but the blown head hgaskets are common on this 3.4
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it isnt liklely for this head to be cracked,but is possible,,
i would have a machine shop microflux the heads to check for cracks,too much work not to check them while you have them off