Offenhauser Cross Ram Manifold

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My father just last night was talking to me about this manifold. he had one on a 427 truck block that he built up and installed in a 70 nova. He said he if he built another hot rod it would have to that combo cause he said none of his other muscle cars that he built back in the day could match it. He said the sound of it would make your heart skip a beat but he did run open headers so that could contribute towards it. So now I am on the search so he ahs to build opne again