chevy straight 6 drag engines.

[bismarck]

Did anyone in the late 50's early 60's run modified intakes to run 4 barrel carbs?

[Longbox55]

Offenhauser and I believe Edelbrock have made 4 bbl intakes for the Chevrolet 235 6, mostly using a 360 cfm Holley, but I don't think those were around until much later, perhaps the late '60s at the earliest. Multiple singles or small 2 bbls depending on intake used would have been the norm for a 235/261. 2 or 3 singles were common on Offy/Fenton/Edmunds/Nicson intakes, Howard had one that took 5 (yes, 5) Stromberg 97s, though those are far more common on the GMC 6.

[Longbox55]

There is one other manifold I didn't mention, actually forgot about it until earlier today; The S.C.o.T supercharger and intake. It's the same supercharger that they produced for the Flathead Ford, but with an intake for the '37-'62 Chevrolet 6. They are extremely rare.