HOLLEY Standard Main Jet #42 1/4-32 Thread .042″

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.

Overview

• Description: Standard Main Jet
• Part Number: 122-42
• Supplier: Holley
• Size: 1/4-32 Thread, .042″ Jet size

For over a century Holley has driven the cutting edge of fuel-system design. That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. Top brands like MSD and many more make up the industry’s leading offering of enthusiast-driven products to deliver robust, complete performance solutions for builders, racers, and drivers. From propelling the LS-, Coyote-, and Gen 3 Hemi-swap trends, to continuously innovating late-model and vintage vehicle performance, Holley’s commitment to its customers and their cars is at the core of everything Holley do.

Here at Serck Motorsport, we manufacture, supply and distribute many premium performance cooling products for your race car having used them ourselves! Many of our techniques come directly from our practices with premium motorsport teams in Formula 1, British Touring Cars, Drag Racing, Drifting Series, NASCAR, etc.