they are a 7x11 or 12.
older models used a staggered lineup to atomize fuel better.
newer ones do not.
I do know that compared size to size of holes, they make more cleaner power than almost anything else..
Mach 7's flow around 2.9lpm on Exergy's test stand. To make more power with a standard 7 x .012 I had to go over 4lpm. Yes, Mach 7's are really good injectors.