Late 310 blocks.

My 1855 has this 310 replacement block. It has no relief valves in the block. It would peg out the pressure gauge cold and I didn't like that. I added a external relief valve to keep the pressure down to 60 cold. I cannot find a bulletin discussing this block or if it needed the pump relief valve set different. I traded a e mail about it with some one on this site a few years ago but I can't find it now. Does any one know the history of this type of block?
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