THIS!!! I've seen several with issue when we were running 4.3s in full size work trucks. After replacing the LIM at 50 to 70 thousand miles the timing chain (possibly with the worn distributor) would start throwing codes at 180 to 200 thousand miles. We usually sold them at that point rather than fix them.
If GM would have just put a decent lower intake manifold gasket in those engines they would have been a good bullet proof engine up to 200K. As it is you can expect a $1000 repair bill when they are in their prime - and many are ruined because the owner ignores the blown intake manifold and coolant becomes a main ingredient in the oil pan.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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