The best solution is to try to find a correct APT manifold (for the "long block"). Unfortunately the APT parts book only lists a part number for the intake and exhaust manifold assembly. So one has to check their old manifold for the casting number for both the intake and exhaust manifold: the only reliable way to source these parts.
Generally, commercial long block manifolds are at best a bad compromise: commercial versions don't have 3 ports for the primer pump nozzles on the intake manifold, they generally have a carburator flange that is too high to accomodate the APT carb and they have odd-ball 4-bolt outlet flanges at the wrong loaction.
Maybe somebody has a loose APT manifold to check the casting numbers: unfortunately the casting on the exhaust portion is on the lower side and almost impossible to see when the manifold is on the truck.
........ Brian
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08-11-12, 00:27
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