HENKYO Dual-Diameter Air Cleaner Neck Adapter for 4"x2" Filters — 2.625" & 2.27" Inlets, Removable Liner

HENKYO’s dual-diameter air cleaner neck adapter lets you mount a 4"x2" air cleaner on 1- or 2-barrel carburetors with 2.625" and 2.27" necks. Many classic and aftermarket carburetor setups require a flexible air cleaner solution to bridge different neck diameters and bracket configurations. This HENKYO adapter is engineered to accept both 2-5/8" (2.625") and 2-5/16" (2.27") inlet sizes, providing a detachable liner and a universal clamp arrangement that fits common Rochester and Holley single- and two-barrel carburetors labeled SPE-4790 compatible. It’s aimed at mechanics and DIY restorers who need a compact 4" x 2" air cleaner that adapts to various mounting situations.

Will this air cleaner adapter fit my carburetor?

Check the outside diameter of your carburetor neck before ordering. The adapter is made to accept necks of 2.625" and 2.27"; the smaller 2-5/16" liner is removable so you can swap between sizes quickly.

• Designed for 1/2 bbl carburetors and many 1- or 2-barrel Rochester and Holley models.
• Not compatible with Autolite 1100 single-barrel carburetors.
• Includes removable plastic liner for secure fit on the smaller neck.

How does the adapter mount and lock in place?

The adapter uses a locking screw positioned with a measured clearance to secure the assembly at the carburetor neck without interfering with the filter element. Its detachable assembly allows installation with or without an existing air filter bracket.

• Locking screw center-to-bottom distance: 7.5 mm for consistent clamp engagement.
• Multi-functional detachable assembly supports bracketed and bracketless configurations.
• Simple clamp tightening for a snug, vibration-resistant fit.

What are the physical dimensions and filter type?

The package is built around a compact 4" x 2" air cleaner profile that provides clearance in tight engine bays while maintaining airflow for small carburetors. The design keeps the overall height and footprint low to avoid contact with hoods or components.

• Air cleaner external size: 4" diameter by 2" height.
• Dual-diameter inlet compatibility: 2.625" and 2.27" (removable 2-5/16" liner).
• Lightweight construction for reduced vibration transfer and easy handling.

How do I install and maintain this air cleaner adapter?

Installation is straightforward: verify neck diameter, choose whether to install the plastic liner, position the adapter, then tighten the locking screw. Routine checks of the clamp tightness and filter condition keep the system performing reliably.

• Measure carburetor neck before purchase to confirm fitment.
• Install or remove the 2-5/16" plastic liner depending on neck size.
• Periodically inspect the clamp and clean or replace the filter as needed.

Who is this for: This HENKYO air cleaner adapter suits classic car restorers, small-engine mechanics, and DIY enthusiasts who need a low-profile 4" x 2" air cleaner that adapts to multiple carburetor necks. If you work on Rochester or Holley single- or two-barrel carbs and want a compact, serviceable solution that mounts with or without an air filter bracket, this part is a practical choice. For any issues during purchase or installation, contact the seller through your order page for professional assistance.

FAQ

Q: Will this fit my Autolite 1100 carburetor?

A: No. This adapter is not compatible with the Autolite 1100 single-barrel carburetor.

Q: Can I use it with carburetors that have an air filter bracket?

A: Yes. The detachable assembly supports installation with or without an air filter bracket.