rocker arm geometry

not true fishey
the rdius of the roller must be compensated for by raising the shafts
and
the only wys to move to center of the valve once the above is accomplished are rockers with a different ar length or move the shafts back

go to the b3 racing industries web site and read all 4 tech articles

"Years ago, the 90's, I worked for Rick Herrick. Rick's shop was in Ft. Lauderdale right down from Harvey Cranes old shop. In the early days Rick made a bunch of stuff for Harvey and other cam companies. One day it cam up about the pattern on the valve tip and valve guide wear. His reply was "Harvey and I proved 3 years ago if the sweep is no wider than .060" then its within 2/3's of the middle of the valve you will not wear out the guides. If it is centered and .070, it will wear the guide out."
Chris Straub

so true but early crane rockers were all wrong so he sold them as "quick lift"