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On a 351W, the pressure relief valve is in the pump. I would get a new pump, preferably a mieling HV unit. HV is the series of pump that is high volume and you can install a pressure relief spring of your choice at that time. I would also blueprint the pump or have it done if you do not know how. I know that this sounds like a lot to do but it is cheap insurance. I have done this on EVERY motor that I have ever built, (3000 plus motors) from the start and never had a problem. Good luck, Scott
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