Holley Carburetor Standard Main Jets - Size 78
Precision Fuel Metering for Performance Carburetors
These metering orifices control fuel flow into the metering system and are rated in flow capacity "cubic centimeters per minute" for precise carburetor tuning. The shape of the entry, exit, and size determines flow characteristics, ensuring optimal performance for your engine.
Quality Construction & Testing
- Flow Tested & Verified: All Holley Main jets are flow tested and then stamped with the correct number for accuracy
- High-Quality Brass Construction: Manufactured to high tolerances for consistency and durability
- Threaded Design: Easy installation and removal with 1/4"-32 UNF thread
Specifications
- Jet Size: Number 78
- Jet Hole Size: 0.089" (2.261 mm)
- Thread: 1/4"-32 UNF
- Material: Brass
- Quantity: Sold as a pair (2 jets)
- Fuel Type: Gasoline
Compatibility
Fits All Holley Model 2010, 2300, 4010, 4011, 4150, 4160 & 4500 carburetors. These jets are changeable for tuning purposes and are designed for gasoline-fueled vehicles.
Note: Jet hole sizes provided for reference only. All Holley jets are sized by actual flow and may vary from sizes above.