Holley main jets are metering orifices that control fuel flow into the metering system, rated in flow capacity and stamped with the correct number after flow testing.
Specifications:
- Brand: Holley
- Category: Air and Fuel Delivery
- Product Type: Standard Main Jet
- Jet Number: 70
- Jet Size: 0.073"
- Thread: 1/4-32
- Material: Brass
- Sub Category: Carburetion
- Part Number: 122-70
Fits all Holley Model 2010, 2300, 4010, 4011, 4150, 4160, and 4500 carburetors. Not for use with carburetors originally designed for alcohol. Jet hole sizes are provided for reference only; all Holley jets are sized by actual flow and may vary slightly from the listed figures.
FAQ
What carburetors does this jet fit?
All Holley Model 2010, 2300, 4010, 4011, 4150, 4160, and 4500 carburetors.
Can this be used in an alcohol carburetor?
No, it is not for use with carburetors originally designed for alcohol.
What does a main jet do?
It's a metering orifice that controls fuel flow into the metering system; the shape of the entry, exit, and size determine flow, and it's changeable for tuning purposes.
What is the part number?
Holley part number 122-70.

