340 coolant in oil

Milkman said
The motor was running normal temp. It seemed to run ok until it warmed up, then it began to misfire badly and had no power. It also sounded different as if it was only running on 4 cylinders. It also would die at idle. There was not any smoke coming from exhaust.
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What kind of intake does it have? It’s rare, but I have seen an intake crack through the exhaust cross over into the plenum under carb and cause what you described. It may merit a pressure test on exhaust heat crossover passage in manifold as well...