Food for discussion. I and the fellow tech repair alot of gm lower intake gaskets as we all do. 3.1, 3.4, 3.8, 5.0, 5.7, so on. For the past 2 or 3 years there has never been a come back of any sort. As of the last 3 months, 4 of the 3.8 engines have come back... Login to read more.