This improved jet extension screws into the metering block, with the main metering jet threading into the end of the extension. This moves the fuel entry point for the main jet out into the fuel bowl, where it can't be uncovered by fuel during hard acceleration or braking, preventing a lean condition.
Specifications:
- Brand: Holley
- Category: Air and Fuel Delivery
- Material: Brass
- Part Type: Carburetor Metering Jet Extension Kit
- Product Type: Main Jet Extension
- Sub Category: Carburetion
- Quantity: 2 per package
- Part Number: 122-5000
Requires the use of a special "notched" float to achieve proper clearance and operate correctly, notched float number 116-11, or kit with float and extensions 116-10.
FAQ
How many jet extensions come in a package?
2 per package.
What does this jet extension accomplish?
It moves the fuel entry point for the main jet out into the fuel bowl so it can't be uncovered by fuel during hard acceleration or braking, preventing a lean condition.
Does this require a special float?
Yes, a "notched" float (part number 116-11) is required, or a kit with float and extensions (116-10).
What material is this jet extension made from?
Brass.

