For what it's worth out there, I'm assembling a Boss with steel roller rockers.....they were made by AR for the E2ZM/E3ZM Motorsport hemi Boss head that was offered in the 80's and early 90's through Ford Motorsport. Try to find these things now.....they're like trying to find hen's teeth!
The problem with these rockers however is the fact that they have no provision for pressure oiling the rockershaft/rocker bearings, as the stock set up had. They were set up for splash oiling only, and they had their problems. I have several broken pieces to prove it.
I was forced to MAKE MY OWN rocker shafts out of 4340 chrome-moly, drill
oil feed holes in them just like the stock Boss rockershafts, have them heat treated and ground to size, and then I had to eliminate the caged roller bearings in the rockers cause they have a tendency to wear the shaft. I made some 01
oil-lite bronze bushings to the right i.d/o.d., pressed them into the rocker bodies, and honed them to fit the new shafts, and now I have a full set of investment cast stainless roller rockers for my Boss that utilize the factory pressure
oil feed holes.
I feel that these will hold up much better than the way AR originally designed them, and I will be able to report the results soon as I finish the engine here in the next month or so, and I will let you know how everything worked out when I go to dyno.
Hope this helps!!
Eric Simone
Diamond Racing(.net)