Can you explain in more detail the issues with 7.3 rockers vs 6.9 rockers? I was under the impression the aluminum pivot/bridges on the 6.9 setup wear rapidly, hence the change to a standard cheapy pedestal rocker with steel pivot. Is this issue overstated?
I have a 6.9 and parted out a 7.3, kept the rockers among a few other bits. I intend to swap the 7.3 rockers on when it's convenient to do so. Should I not do this if upon inspection my 6.9 rockers and pivots show minimal wear? I'd like to know the reasoning and best course of action. I believe IDIOIT was the one who got roller rockers made but did not use them as there were a few issues with how they were made, forget exactly why. I know these engines wear valve guides but I don't see how aluminum vs steel pivot would have any effect on that as sideways/sliding friction on the valve tip isn't affected by pivot material or construction, only tip construction.
Also are there geometry issues with any of the factory rockers? Should these be checked for valve tip contact pattern? Never done that on a non roller rocker. I have checked and adjusted preload with shims though, should that be done with these on a stock cam given 100k-200k miles? Or would any significant variance indicate lifter wear/replacement rather than adjusting preload at rocker?