Carb/efi Adjustable Billet By-Pass Regulator-6AN Carb/efi Adjustable Billet By-Pass Return Style Fuel Pressure Regulator 6AN Boost Reference 11 HolleyHolley 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. These regulators are adjustable from 4 65 psi and will handle both carbureted and EFI applications. A second pressure spring is included allowing you to increase the fuel pressure range up to 65 psi for EFI systems. They are offered with two port sizes, 3 8 inch
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