Universal 3/8" NPT EFI Fuel Injection Pressure Regulator Blue w/ Boost Ref Port they are made from 5140

they are made from 5140 Chromoly steel

These headers are designed with 3/8 in

Windsor and Big Block versions are built from sturdy cast aluminum

a gilmer kit is a must for street or strip engines

Universal 3/8" NPT EFI Fuel Injection Pressure Regulator Blue w/ Boost Ref Port they are made from 5140These Speedmaster EFI fuel pressure regulators give you total control of your fuel pressure settings. The regulators feature AN O ring boss inlet, outlet, and return fittings, a 1 8 in. NPT gauge port, and a 1: 1 fuel pressure rise from the boost reference port. Speedmaster EFI fuel pressure regulators are anodized for great looks and corrosion resistance.