EZAPEX Carburetor Main Jet Assortment Kit 72-Piece for Holley 2010/2300/4150 — Brass, 1/4-32 Threads

EZAPEX 36-181 Carburetor Main Jet Assortment Kit is a 72-piece set of precision brass main jets (#64–#99) designed to fit Holley carburetor models 2010, 2300, 4010, 4011, 4150, 4160 and 4500.

This assortment gives mechanics, tuners and DIY enthusiasts a complete selection of main jets for quick carburetor calibration and testing. The kit includes two of each size from #64 through #99, machined in brass for consistent fuel metering and long service life. Jets are organized in a labeled plastic case with 1/4-32 threads, making it straightforward to swap or try multiple sizes during tuning sessions without losing parts.

Which Holley models will these jets work with?

These main jets are sized and threaded to be compatible with a range of Holley carburetors used in automotive and performance applications. They cover common original equipment and aftermarket Holley models where main jet replacement is required for tuning or repair.

• Compatible with Holley Model 2010 and 2300 series carburetors.
• Fits Holley 4010, 4011, 4150 and 4160 performance carburetors.
• Also works with Holley 4500 series applications that accept 1/4-32 threaded main jets.

How does this kit help during carburetor tuning sessions?

Having a broad selection of jet sizes on hand lets you quickly dial in air/fuel ratios without waiting for individual parts to arrive. Each size is duplicated, so you can test a change on both barrels or keep a backup in the case. The clear organization reduces downtime and improves repeatability when logging results.

• Two jets per size (#64–#99) for mirrored tuning or backups.
• Labeled compartments let you find sizes instantly during testing.
• Brass construction resists wear for consistent thread engagement and metering.

What are the construction details and thread specification?

The jets are machined from brass to balance corrosion resistance with ease of installation. The standard 1/4-32 thread engages commonly used Holley main jet seats, ensuring a secure fit and predictable fuel flow. Brass also minimizes galling when compared with harder materials, which helps preserve both the jet and carburetor seat.

• Material: precision-machined brass for durability and consistent metering.
• Thread size: 1/4-32, matching many Holley main jet fittings.
• Range: sizes #64 through #99, covering common tuning requirements.

How is the kit organized and stored for practical use?

Jets come in a compact plastic case with individual labeled slots so each size stays separated and protected during transport. The case is translucent to let you scan inventory at a glance, and the compact footprint fits in a toolbox or shop drawer. Two of every size are arranged sequentially to make selection effortless.

• Durable plastic storage case with labeled compartments for each size.
• Translucent lid allows quick visual inventory checks.
• Compact design for toolbox, bench, or service cart storage.

Who is this for? The EZAPEX 36-181 kit is built for professional mechanics, engine builders, tuners and hobbyists who routinely adjust or rebuild Holley carburetors. If you need a complete, ready-to-use selection of main jets for engine dyno work, street tuning, restoration projects or on-the-fly troubleshooting, this assortment supplies the sizes, durability and organization to streamline that work.