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Nice pic. As it shows, the passage splits off from the cam journal passage a little ways up from the main (my arrow in the pic below). This is easily accessable in mains 2 through 5.

BUT...then again, it looks like oil flows away from the main in number 1 instead of to the mains in the others. So maybe no mod is required here?



...Pressure, but then again #4 has a problem with getting oil at higher RPM's.



That is true , there is a mod that can be done that will direct feed the head and you block off the passage from the cam , you have to add a restrictor to each head .