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New Offenhauser aluminum intake manifold for the old style big block Chevrolet W series 348/409 engines. This will fit all the passenger car 58-61 348 cid engines & the small port 1961 360 hp 409 engines. This will not fit the large port 409 engines. It's made for 6 Stromberg 3 bolt 2 bbl. carbs. Offy part #3925. You don't have to run all 6 carbs. You can run off the center 2 carbs, or the outer 4 carbs, or all 6