Has anyone had a problem with their rocker arms and valve spring retainer clearance? my machine shop guy set up a set of J heads for me with Ferrea stainless valves (1.60 & 2,02) pn 5051&5050 Comp 10 deg. retainers and locks Comp springs, I have tried 4-different sets of rockers on these heads (1.5 ratio)along with 0.30 shims under the shafts and lash caps the only ones that will clear is an old set of 273s (iron) that have been ground away in the shaft area and under the arm itself, the heads were set up for correct spring height etc. and for use up to a 600 lift cam, I am running a solid lifter cam with only 528 lift I had these heads on my other engine with a 557 lift cam same problem. I have a lot of money in these heads and hate to buy another set.