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I think the only problem with the 3.5 is the headgaskets, like the 3400 head bolts they tend to get loose after a while. It only affected some model years though (correct me if I'm wrong). Besides the intake manifold gaskets run dry (no coolant running though it) so no leaks there. Someone said that GM took the northstar V8, cut it down to 6 cylinders and screwed up. Not sure about that lol.
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