Holley 122-42 Carburetor Standard Main Jet
Standard Main Jet, 1/4-32 Thread, .042" Jet size;Standard Main Jet; .042" Jet size; 1/4-32 Thread; Sizes from 40-110; Fits All Holley Model 2010, 2300, 4010, 4011, 4150, 4160 & 4500; Jet Hole sizes provided for reference only . All Holley jets are sized by actual flow and may vary from sizes above.;