Rocker shaft hold downs
Okay once again. I have the Hughes rockers and their holdown kit. Right in the instructions it says that you may need to machine as necessary the blocks to to insure proper rocker tip to valve tip alignment. There are round spacers that go in between the intake and exhaust rockers and the shims are used to get the right amount of clearance there. The 2 wider holdown blocks out of the 5 are oversize and these are the ones that need to be machined. I'm running Eddie heads which are designed to accept stock valve train hardware. I compared one of the stock rocker shaft holdown blocks to the Hughes and the Hughes is wider. When I put the Hughes blocks on the shaft, I was no where even close to having the roller tips centered on the valves. When I completely assembled the rocker shaft and tried to install it, I couldn't even get the last holdown bolt into the head because of how much everything was off to one side do to the stack up of the larger spacers.
I called Hughes about it at the time and was told that yes, machining was required on the blocks to get the proper alignment. So I guess they either have changed their design in 4 years or somebody isn't being told the whole story.