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LooKing for a offenhauser dualpor intake manifold for a big block chevy, these were not well as far as performance but were designed for fuel economy , in search of one for my motorhome
can be recognized by horizontally split intake runners
feel free to leave me a pm in this forum thanks
Edelbrock manufactured some 180-degree, dual-plane manifolds back in the 70's that were designed for efficiency, called Streetmaster. If you can't find what you're looking for, maybe try to find the Edelbrock design. I used one on a 302 ford, tons of low end torque and throttle response.
i have not seen one in 20 years . the rigth cam and the edelbrock dual plane intake may work as good or better
I have one of those useless manifolds for a 318 Dodge, no more power than a 2bbl and no better mileage than a 4bbl Hirise. Don't bother with them, use a regular 180 degree manifold.
The dual-port is not a 180 degree job, its like a couple of Torkers superimposed on each other.