wsuwrhr:
7-9 is max as long as you aren't running the Baja 1000 bouncing up and down. haha. I run all mine at 7-8. Mechanical pump should be ok without a reg, but why do you want to do that?
Brian Don't really want to plum in a regulator. And a friend has a new Holley Mech pump for me...7-9 psi, If I want it.