Please see the attached picture. Is the item I circled in red the vacuumcock? I'm trying to find were the hose coming out of the top is supposed to connect too (identified with the red arrow)

I'm looking at the AC FSM for a 1974 260z, mine is a 1975 280z. I'm thinking it could also be a check valve on page AC-34.

Kind regards,

Robert

The 74 260Z is carbureted and the 75 280z is fuel injected so the two are not similar enough to comare for your purpose. Get the correct manual. You should be able to get the one you need here: XenonS30.

That is where the manual came from. If you look at the site you'll see AC is missing from the 1975. There is no other choice but to look at the 74's or 76's at least on that site.

Looking at a '76 would be a much better choice.

I've seen those on the 280zx's. Maybe try one those manuals.