Holley Regulator Rebuild Kit - Fits 12-840 and 12-842 Fuel Pressure Regulators HSXSM11SAS and absolutely the best quality

and absolutely the best quality American-made manufacturing possible

Eagle Street & Strip assemblies are recommended for use in naturally-aspirated

There's a PRO 1 head for virtually every small-block engine

and billet accessories are all made in-house by a talented group of people

They each feature wide application coverage including the popular domestic trucks and muscle cars

Holley Regulator Rebuild Kit - Fits 12-840 and 12-842 Fuel Pressure Regulators HSXSM11SAS and absolutely the best qualityRegulator Rebuild Kit Fits 12 840 and 12 842 Fuel Pressure Regulators Regulator Rebuild Kit for 12 841 and 12 842 Billet By Pass Regulators. Includes complete diaphragm, spring and rebuild instructions. Features: Fuel Pressure regulator rebuild kit for Holley HLY12 841 and HLY12 842 fuel pressure regulatorsHolley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA