I have an early six cylinder Ellis aluminum manifold that I believe is for a GMC product but have been unable to determine what it fits. It measures 24" long, 6 3/4 " between carb bases, 1 7/8" I.D. intake ports and about 2 7/8 between the carb studs. The front side say ELLIS Dual Power Manifolds 23 CAL. PAT. D154886. One port has 360 stamped on it. Another port has in raised letters: CU.IN. and below the lettering is GMC It is equipped with single barrel Zenith carbs. What does it fit? All help is appreciated.
Sounds like it fits the "series II" engines, 308-361-426-503 cubic inch medium duty truck powerplants.
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