I would like to see more about this too.the early gsxr's had poor oil pressure when under load...the best kits feed of the cam cover and to the cam bolts...yoshimura has a trick to mod the cam cover also to improve oil pressure ..more the better ...if you need pictures I can email them to you ..thanks
I don't understand how a modification to the cam cover, to increase oil pressure, would be of any aid. As I understand it, the can cover oil passages only act to provide cooling oil to the head. An increase of back pressure, would only reduce the overall flow of cooling oil. To me this doesn't seem like a good idea, but the Yosh engineers must have done it for a reason.