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  1. #1

    Join Date
    Jul 2006

    158 mm pump impeller size

    I have istalled into my gpr superstock race fuel 158mm magnum pump set back wich pich impeller I need to install?

  2. #2
    philip_gpr's Avatar
    Join Date
    Dec 2005
    will be less than the 155 pump

    bigger impeller means less pitch

    depends on your motor - maybe something like a 16/19

  3. #3
    16/19 is a good starting point with a full superstock

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