aftermarket retrofit kits are all Johnson AFIK
setup springs and cam make a big difference
with most shorter cams you do not get any more action from a HR than a .904 hyd much less a FTSOLID
you have to use an inverse radius on the flank
but of course there's the lube problem
Well I am not sure who is making all the aftermarket hyd roller lifters but they sure are getting a bad reputation. As for myself I am done with hydraulic lifters.
I have been adjusting valves for 45 years why stop now, when I get too old I'll just pay someone to do it. LOL
