These metering orifices control fuel flow into the metering system. They are rated in flow capacity cubic centimeters per minute and are changeable for tuning purposes.

The shape of the entry, exit, and size determines flow. All Holley Main jets are flow tested and then stamped with the correct number.

Click on Catalog Product Page for complete listing of jets and sizes.

Features and Benefits:

• Fits All Holley Model 2010, 2300, 4010, 4011, 4150, 4160 & 4500 Sizes from 40-110 1/4-32 Thread .040 inch Jet size Standard Main Jet Jet Hole sizes provided for reference only
• All Holley jets are sized by actual flow and may vary from sizes above.

Associated Comments:

• Not For Use With Carburetors Originaly Designed For Alcohol

Details:

• Grade Type: Performance
• Head Diameter: 0.31 Inch
• Jet Number: 40.0
• Jet Size: 0.040 inch
• Length: 0.35 Inch
• Material: Brass
• Orifice Diameter: 0.04 Inch
• Thread Diameter: 1/4-32 Inch
• Warranty: Manufacturer's Limited 90 Day Warranty