OS91 C Spec PS

[Xtreme*76]

Hi to all
yesterday I bought my new engine
Does anybody know
why there is an exagonal screw on the top of the pump?
Do I have to use it to set pressure or anything else?
Please help will be very appreciated
Thank you very much
Best regards
Giuseppe

[WillJames]

Leave it at the factory setting. I have seen this setting vary with hte screws at different points of being screwed in, but they all worked. I think it is set at the factory, so I just left mine where they were unless there was a problem.

[mevigavant]

Does anyone know what screwing it in or out does? I have a c-spec that I added a perry pump to and did the spring "mod" from CY web site.