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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?



That is just the way the picture is drawn , oil goes in 2 directions from the main galley that goes across the front of the block, the mod is to open passage that flows towards the main and to restrict the passage going to the cam.