The Holley 122-250 is a main jet assortment kit for track-tuning the fuel curve on Model 2010, 2300, 4010, 4011, 4150, 4160, and 4500 carburetors. It includes two each of every gasoline jet number from 80 through 89, held in a black anodized Holley billet plate that keeps them sorted and accessible.

Holley 122-250 Kit Contents:

• Main jet assortment for Holley 2300, 4150, 4160, and 4500 carburetors
• Two each of jet sizes 80 through 89
• Black anodized billet storage plate
• Genuine Holley 1/4 in.-32 brass gas jets
• Sold as a kit