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Last year I had that done on my 2006 Pontiac Torrent ( like an Equinox) had the 3400 motor in it. Thats what it looks like heads off and new gaskets on.
So they replaced the head gaskets and planed the heads at a machine shop. I had them install in sparkplugs too. $1800.00 excellent job. The Chevy dealer gave me a price for it to at $2400.00