Shutoff pressure pre-set from 6.5 to 8 PSI. Fuel pressure regulator is not required due to build-in shutoff. Heavy duty construction for continuous high RPM operation. Lower pump body can be clocked in different positions to tailor specific orientation needs.Inlet & outlet tapped for 3/8 NPT. Rbureted Chevrolet Small Block V8. Inlet Size: 3/8 inch NPT. Outlet Size: 3/8 inch NPT. We also have thousands of other High Performance Parts in our store. We want you to have the parts as bad as you do.