If you look at a radial engine of the double row type from the prop shaft end and see the cyls. in firing order number for at least the first five cylinders you will get a better understanding of the reason for the sequence of events of the firing order and very basically it will show the production of equal and opposing power strokes in the full cycle and will give you a look see at the degrees that is a set angle for each engine.
The R-4360's were referred to have four rows with seven banks of cylinders.
One comment on the thread talked of a double spline on the Bendix fuel injection
pump that could be put on 180 degrees out of time. I can asssure all that was never the case, all the injection pumps had only one master spline on the shaft and an indexing point of attachment and they were very particular to the R-3350 turbo-compound engine on the Super Connies.