Valve Tip/Rocker Height Question??

So valve tip length is critical no matter what type of rocker you use...CORRECT??/ If you set the valve to the correct height then you won't have any problem with scrub (especially if you have adj rockers), RIGHT?? Now I think I understand...the distance from the rocker PIVOT point (to the valve) will never change so the tip of the valve has to be very close to the correct height to keep the relationship between the valve and the rocker correct...is that right??/ So you set the valve to the correct height (by the book) and you get the correct "scrub" by getting the correct push rod length and adjusting the rockers for correct valve lash (hyd). The only way to correct scrub discrepancies is to change the valve height (or maybe shim the rocker shaft)??

treblig