Oil cap, breather ID 1971 351C

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Hello Ryunker,
The OE oil fill caps used on all '71-3 Mustangs are open with no inclosed filter, unlike the caps used on earlier engines and incorrectly used on the '71/ Mustangs. There is a standard black cap (D1AZ-6766-A, Motorcraft EC-8-A) and an optional chrome cap (D1ZZ-6766-A, Motorcraft EC-508). The same cap was used on both valve covers. A grommet is used in the cap in the left valve cover for the PCV valve and another in the right side valve cover for the adapter, which retains the hose to the air cleaner contained crankcase emissions filter.
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Hello Ryunker,
The OE oil fill caps used on all '71-3 Mustangs are open with no inclosed filter, unlike the caps used on earlier engines and incorrectly used on the '71/ Mustangs. There is a standard black cap (D1AZ-6766-A, Motorcraft EC-8-A) and an optional chrome cap (D1ZZ-6766-A, Motorcraft EC-508). The same cap was used on both valve covers. A grommet is used in the cap in the left valve cover for the PCV valve and another in the right side valve cover for the adapter, which retains the hose to the air cleaner contained crankcase emissions filter.
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Anybody have a spare black one for sale?
 

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Thanks again to PoFoMoCo for the oil cap, installed it and the air cleaner assembly from another member today.

Now looking for direction on20230429_114058.jpg
Fitting to attach to air cleaner, and correct-ish elbow for valve cover

And photos of what goes in the oil cap, I am convinced its the PCV valve, then hose to base of carb.

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