Die Cast EFI By Pass Style Fuel Pressure Regulators 12 882 wheel spacers and adapters Jet sizes selected will give 49449 FBHB Jet sizes selected will give the broadest range of adjustment and tuning for most performance carburetor applications 8L L6 1973 1974 Chevrolet Blazer 250 4 Brand Holley Color Chrome Emission Code 5 Fuel System EFI Fuel Type Diesel Fuel Type Gasoline Inlet Size 3 8 inch NPT Material Aluminum Outlet Size 3 8 inch NPT Pressure Range 15 60 PSI Product Type Fuel Pressure Regulator Return Size 3 8 inch NPT Style Bypass Warning California Proposition 65 Warranty Limited 90 Day Holley does it again with their new die cast aluminum fuel pressure regulators