HP Billet Carbureted By Pass Fuel Pressure Regulator - 12-845 perm-street-carbsavengers you should measure to see

you should measure to see if a shim is necessary for proper installation

4L V8 1979 - 1986 GMC K3500 454/7

Barrels 4 Booster Straight Brand Holley Carburetor Use Performance and Race CFM 750 Choke Electric Condition New Emission Code 3 Finish Shiny Fuel Gasoline Fuel Inlet Dual Marine Use No Material Aluminum Model 4150 Primary Main Jet 70 Primary Power Valve 6

If you're going the route

HP Billet Carbureted By Pass Fuel Pressure Regulator - 12-845 perm-street-carbsavengers you should measure to seeOverview: Holley Billet Fuel Pressure Regulators are part of a complete line of fuel system products from Holley. They are precision machined from 6061 T6 billet aluminum for strength and durability. They feature a black bright dip anodized body and a clear bright dip anodized top for corrosion resistance and good looks. The Holley 12 845 fuel pressure regulator features (1) 8 AN O ring inlet, (1) 8 AN O ring outlet, (1) 6 AN O ring return. Features: