Hi Tim , Actually the mods to the valves/ retainers will not raise things as much as it may seem. Clearance from the forked end of the rocker, the base of the upper guide and the collar is a slight issue......All will be reveled. I will start a thread on this whole project, but time on the bike is more important. But some advice from the likes of yourself would be Invaluable. Cheers for now...Greg