Holley 122-5000 - Holley Main Jet Extension Details
Requires the use of special "notched" float to achieve proper clearance and to operate properly. Notched float number 510-116-11 Or Kit with float and extensions 510-116-10.
This improved extension design actually screws into the metering block. The extension effectively moves the fuel entry point for the main jet out into the fuel bowl. 2/pkg.