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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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