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I did the RSR seals when I put my engine back together. I thought it was a bit difficult installing them without tearing them when putting them back in. When sliding some into the bore I know I gave a few of them a slight shave.
The deformation is caused by improper removal of the rocker as I understood it. The bore gets slightly deformed. I'm not aware of rocker shafts deforming when removed but I really haven't looked into it. When I put my engine back together I had a set of long hex sockets that I was able to use with an extension if needed and then attached to a torque wrench. I think a few of the builders here recommended a slightly higher torque spec than the manuals stated for reinstallation of the rocker shaft.
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Nick
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