Here is a photo of a slant 6 rocker arm with a piece of spaghetti showing a straight path that could be cut to enable the adjuster screw to be moved about .080" toward the shaft, which would increase the lift ratio somewhat. I did some measuring and that amount seemed to be about right for a 1.6:1 geometry.
Those rockers are heat treated, so it's going to take an aggressive cutter to get the job done. Once they are in 2 pieces, a jig will have to be used to hold them in proper alignment for proper welding.
Someone (probably Aaron???) might have the skills to accomplish this. I would try it, but I KNOW there are guys out there who could do this blindfolded, while ~I~ was thinking about it...
What do you guys think??? Is this do-able?