Home / Air and Fuel / Carburetors and Components / Carburetor Jets and Components Main Jet ExtensionJet Extensions – Screw-In – 1/4-32 in Thread – Brass – Standard Holley Jets – Demon / Holley 4150 / 4160 / 4500 Carburetors – PairSee More Specifications $16.952 in stock (can be backordered) Main Jet Extension quantity Add to cart Buy now SKU: HLY122-5000 Category: Carburetor Jets and Components Related products Carburetor Jets and ComponentsMain Jets (2) $15.28HLY122-73Add to cart Carburetor Jets and ComponentsMain Jets (2) $14.69HLY122-56Add to cart Carburetor Jets and ComponentsMain Jets (2) $14.69HLY122-83Add to cart Carburetor Jets and ComponentsMain Jets (2) $14.69HLY122-84Add to cart