What size breather goes on A stock 318 carb?

[wayner67]

i bought a 1970 318 and it has no breather and the engine isnt in front of me to measure the neck on the carb to fit the breather can anyone help?

 

[rumblefish360]

The base of the air filter lid? I think it's something like 2-3/8? I'm not totally sure.

However, if you want to put a 4bbl air cleaner up top the 2 bbl. , Mr. Gasket makes a plastic ring adapter. I think trans dapt also makes this item. Auto Zone had it for myself.

The pack of rings adapts the 2bbl carb neck to a standard 5 - 5-1/4 (I think it is or something like that) 4bbl air cleaner base.