Tight rocker arm

[evofatboy]

I am trying to install a set of jims rocker arms into S&S rocker arm supports. They don't fit. Taking measurements it looks like I need to remove .013 thou to give me  .003 end play. Do I remove this material from the rocker arm or the rocker arm support?

[Ohio HD]

Is the support bolted to the head?

[evofatboy]

No. I have it on my workbench. thanks

[Burnout]

Do you have a stock rocker arm to compare the length?
Rocker box?