Frank..I can't remember exactly what the heat exchanger valve looks like on a 70 gas. The all fuel valve is the same shape and dimensions (I think) but in addition to the large rectangular opening that routes the exhaust gas from the flywheel side cylinder to the front of the manifold where the carb bolts to...there's a circular 3/4 inch opening that routes some exhaust gas at the same time to the back side of the manifold. Can't recall if the gas manifold valve has that small hole (???) This 70AF is a "project" that has an interesting history...otherwise I wouldn't be trying to resurrect it. It started it's life in Montgomery, Alabama and somehow found it's way to Wisconsin. Surprisingly, I have a 70 diesel with the same lineage. Wonder if these were "dealer swaps" due to them not selling in Alabama (???)
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