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Vehicle Info NeededHOLLEYPART NUMBER: 510-122-5000
122-5000 Main Jet Extensions 2/pkg
$1806
1 left in stock
Ships on Nov 02, 2026
Lowest Price Guarantee
Main Jet Extensions
- Main Jet Extensions
- 2/pkg
Installation Notes:
Requires the use of special "notched" float 510-116-11 to achieve proper clearance and to operate properly. A notched float kit 510-116-10 with float and extensions is also available.
- The Holley Main Jet Extension is designed to screw into the metering block allowing the main metering jet to be threaded into the end. This moves the main jet fuel entry point out into the fuel bowl where it cannot be uncovered by fuel and cause a lean condition during hard acceleration or braking.Installation Notes:
Requires the use of special "notched" float 510-116-11 to achieve proper clearance and to operate properly. A notched float kit 510-116-10 with float and extensions is also available.
Part TypeCarburetor Jet Extension
Product LineHolley Main Jet Extension
BrandHOLLEY
Package Height0.6
Package Width3.5
Package Length5.1
Weight0.0315 PG
Part CategoryPerformance Parts
Jet Extension StyleScrew-in
Fuel Bowl Gasket IncludedNo
Jet Extension Thread Size (In.)1/4-32
QuantitySold as a pair
Jet Extension MaterialBrass
Float IncludedNo
Part FitmentSemi Universal
Vendor Part Number122-5000
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
