It will also increase your duration, both valves being open togeter longer.
If you have a cylinder head that flows better @ a certain lift, & your lower ratio rockers arms are not getting there to that certain lift, you are missing that little extra flow.
Going to a higher ratio rocker arm will get you to that peak flow number so you can take advantage of your higher lift flowing cylinder head.
I know I am going to a 1.8 ratio, because my camshaft I bought (choices were few) does not bring the valve open enough to the lift I want.
MBHD
