Hughes rockers

So the first thing I can say is when they say clean the inside of the shafts, they're not joking ! Those things are filthy. My geometry and clearances look good without shimming accept side to side, but thats easy. The only problem I'm having is with the hold down studs. They're to long. I've had to stack (grade 8) washers on the hold down clamps so the nuts won't bottom out before the shafts are tight on the pedestals.

I had the same issue with the hold down studs. I called and asked about it. They said to trim the bottoms but I used two washers like you. Annoying to say the least.

I thought it might be that the RHS heads were not tapped deep enough. Not sure which heads you have but if they are RHS I would suspect that's the case.