Pictures of the injector block in place in the coupler (injectors removed), and a bag of the injectors. One can see the convergence pattern of the three injectors by the angles of their threaded holes. The picture flattens the appearance of the surface where the injectors mount. It is somewhat conical rather than flat. One can also see there is a bit of volume available for precombustion after the injectors. That picture is shown with the precombustion chamber liner removed.
Regarding fill lines and time, your bottleneck is typically the orifice drilled in the CGA-326 or CGA-660 fitting on your bottle. You can't get nitrous out of the tank faster than right there.
Edward
I wouldn't oversize the vent orifice to get a faster fill - you will end up using a lot more nitrous filling, and possibly not being able to fill if you grossly oversize it.
Edward
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