I have been looking and searching, but I can't find the answer.

Does anyone know. I couldn't even find the answer in the service manual.

380cc.
On another topic , after install of a B&M Trans cooler ATF was leaking at the return lines. I double clamped and will be monitoring as you suggested. Thanks. If I had went to an event today I may have dumped another tranny.

Get a flaring tool and flare the metal line before putting the rubber line on.
It will prevent a hose blow off.

I read at 350Z.com that Z is 280 or 300cc dpends on years,

How come G is 380cc so much bigger than Z?

A prior thread someone daid it was 290cc:

https://g35driver.com/forums/showthr...light=injector

essentially, it is a 290 cc/min injector rated at a 3bar fuel pressure.

Our cars run at a 3.5bar fuel pressure setting.....which effectively changes these to about a 330 cc/min.

Injector flow rates are proportional and relative to the fuel pressure.