I did use the FEL pro kit.That statement basically answers itself, if the only difference is a replaced gasket then that is almost guaranteed to be the problem, if the gasket slipped or was damaged on installation it can allow the coolant into a cylinder, Rayra has a good point about the compression test but I would bet it is the gasket!! it sucks but sometimes this **** happens, the good thing is it will be easier to do it the second time! And make sure to use the felpro gaskets I posted earlier, any other gasket is an exercise in futility and they don't slip like the other type do!!
I checked for combustion gases in coolant before I started the repair. Twice. No gases found per Lisle kit instructions.
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