Are the self-locking Adjuster Screws and Lock Nut Type interchangeable? In other words can I use same rocker Arm and replace older lock Nut Type Screws with later self locking Type? Is there an advantage to using later style Adjusters? Thanks

  

Yes - I did just that when I was short of a nut type .adjuster..  The thread in the rockers are the same - it's the adjuster that has the interference threads, not the rocker.  The only possible problem is the length of the interference adjuster in the nut type adjuster - it is very close to being too short, but when I did it it just made it. when setting .019 lash


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

So the Arm is different between lock nut Type and interference Fit Adjuster?