I know there's more improvement in it than that if you have time for jetting and getting your spark plugs and timing curve optimized to the rest of the combination....
More improvement yes, but 2.5 tenths is a pretty good gain on a basically stock engine. I mean broom stick for a cam. lol :D
needs 500 lift and more duration to take advantage of the head. Probably a few more tenths to be had.
