Flat Bottom Cowl Induction air cleaner differences

[John Brown]

I only have the last black 350 air cleaner bottom in hand to measure. I put a straight edge across the bottom and oriented it from front to back with the base turned upside down. At the front notch area (where it locks to the carb) it measures 1 13/16, and at the rear it measures 1 11/16. Someone else may have others to measure, but I sold the other 350 and the 427.

[NHRAjeff]

Thanks for posting on flat bottom air cleaners. I own a 69 RS/SS 350 camaro that originally was ordered with a cowl hood from the factory (on window sticker) and was curious if this is the origianal air cleaner as it had an extension ring on the top. Assuming because this motor had a cast iron intake with a Q-jet carb and extension is to put the gasket up closer to the hood? Does this air cleaner appear like the correct item for the car? Label is faded on it. I am third owner and basically almost all original components on this car. Thanks for any help anyone can give.

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[John Brown]

Looks awful original to me. Does yours have a full 90 degree bend on the vent tube also? Sure looks like it. That extention ring looks about right too. If you look closely and use a magnifying glass, you may find a tiny DEMCO stamp surounded by an oval on the ring if the paint isn't too heavy. Demco is the company that supplied them to Chevrolet. Not all of them have that stamp so don't sweat it if yours doesn't have it. Also the original flat ring that held the rubber seal used on 69 Camaros was slightly oval shaped and did not have a flat side like the later one used on 70 and up Chevelles.

[John Brown]

Jeff, as long as we're discussing air cleaners and things, what is the diameter of yours where it attaches to the rubber hose, 3/4 or 1 inch?

[x77-69z28]

the extension ring brought the rubber seal up to the cowl hood. the ss 350 didnt use a hi rise intake like the z-28 or big block. yes it is correct.

[NHRAjeff]

Looked at hose end tonight and measured it to be 1" OD. Also found the small Demco with a circle around it on the top ring. Makes me wonder how many small block 350 SS cars had factory cowl hoods. Thanks John and everyone for the help!!!