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Not sure what year application 4MM is needing, but the duct & valve for 71 and 72 (72 w/o-NOX emissions) for a 351C with and without ram air would be the same. 72 Nox equipped and all 73's would have the provision for the flex hose that connected to the hard plastic tube that ran under the battery. The later model style should still attach to early air cleaner housing.Is the snorkel not the same. The base is with just a different top part and the drain holes for the water? I have one here for ram but not 4-V so I cannot compare except 73 and that is different.
David
Any snorkel off a 71, early 72 4-V should fit the base of the ram air. If you look at the stamping used in the base of the ram air that fits on the carburetor and look at one that is not ram air they are the same with the exception of three holes pierce in the bottom to allow water to drain out. It is the top part of the ram air base that is different. Not the lid but the stamping that holds the rubber seal for the plenum in the hood. You should be able to take the two screws out of the non ram air snorkel and put directly on the ram air base.Thanks for the replies all. I have a 71 3514v. I need a reproduction to modify and attach to an original ram air base.
What is it a plug for the snorkel hole?Found what I was looking for and I won't need to modify the snorkel.
Thanks everyone