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Q: head gasket seal in a can on 1990 Chevrolet 3500 Pickup

That you know of do these work? Did recent head gaskets, surface head, valve job, used Fel Pro head set, did not use any sealer on head gaskets when reassembled, when sits overnight and restart after runs for a bit can see some white smoke out tailpipe, nothing like when gaskets went completely out, losing small amount of coolant, pressure test shows no signs on ground, thinking about using head gasket repair in can to try to seal against white smoke. Any suggestions. Am retired ASE Master Tech. Thanks
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I never used sealer on the head gaskets in those motors. You may have coolant in the exhaust system yet, I don't know how long it's been. Maybe try a pressure test overnight with the plugs out and look in the cylinders for coolant.
I don't know about 'head gasket in a can' so I can't say anything pro or con. Maybe you want to go to a GM specialist to ask for another opinion.
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I should have been more specific, this is months after head work. I am going to pull in shop, pull plugs, pressure test overnight and then see if spits coolant when crank engine. Thanks for any comments.
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