Edelbrock Heat Insulator Gasket for 4-barrel AVS Carburetors — 0.320" Thick with Extended Studs

The Edelbrock 9266 Heat Insulator Gasket is a 4‑barrel nitrile rubber composite gasket with 0.320" thickness and extended studs, engineered to reduce fuel percolation for Performer and Thunder Series AVS carburetors under high underhood heat.

If your engine sees high intake temperatures, fuel can begin to percolate inside the carburetor body and cause vapor lock, poor idle, and hard starting. The Edelbrock 9266 is built specifically to interrupt heat transfer between the intake and the carburetor, giving a thermal barrier that helps stabilize fuel behavior without altering jetting or tuning. It ships with extended carburetor studs to simplify installation where additional clearance is needed.

How does this gasket reduce fuel percolation?

The 9266 uses a nitrile rubber composite that resists heat transmission more effectively than thin paper or metal gaskets. By adding a thicker insulating layer and dividing the center passages, it slows the rate at which intake manifold heat reaches the carburetor bowl, lowering the chance of fuel vaporizing prematurely.

• 0.320" thickness provides measurable thermal separation.
• Two‑hole divided center isolates feed paths and reduces heat conduction.
• Nitrile composite resists fuel and oil exposure better than plain fiber.
• Designed specifically for Performer and Thunder AVS carb patterns.

Will it fit my 4‑barrel Performer or Thunder Series AVS carburetor?

The 9266 is fabricated for 4‑barrel Performer and Thunder Series AVS carburetors; the bolt pattern and divided center align with those carb designs. Confirm your carburetor is an Edelbrock AVS Performer or Thunder Series 4‑barrel; if so, the gasket’s holes, center division, and thickness match factory dimensions.

• Direct fit for select Edelbrock Performer and Thunder AVS 4‑barrel carbs.
• Two‑hole divided center matches AVS feed layout.
• Extended studs included to clear spacers or high‑rise intakes.

How easy is installation and what hardware is included?

Installation is straightforward for anyone familiar with carburetor removal and reinstallation: remove the carb, clean mating surfaces, install the gasket, and hand‑tighten then torque the carb studs to spec. Edelbrock includes extended carburetor studs so you won’t need to source additional hardware if you’re running spacers or a thicker intake setup.

• Comes with extended carburetor studs for extra clearance.
• Install using standard carburetor torque sequence and specs.
• Works with common spacer thicknesses and aftermarket intakes.

What materials and dimensions should I know before buying?

The gasket is molded from a nitrile rubber composite chosen for fuel resistance and thermal insulating properties. Key dimensions and features include the 0.320" overall thickness, a 2‑hole divided center to match AVS feed patterns, and a 4‑barrel layout for full‑size carburetors.

• Nitrile rubber composite construction for durability and fuel resistance.
• 0.320" thickness for effective heat isolation.
• 4‑barrel configuration with 2‑hole divided center section.

Who is this for: The Edelbrock 9266 is ideal for street and performance vehicle owners using Edelbrock Performer or Thunder Series AVS 4‑barrel carburetors who experience heat‑related fuel issues or who run spacers/high‑rise intakes that require added stud length. If you want a direct, dependable thermal barrier that bolts on with included extended studs and keeps fuel behavior stable in hot underhood conditions, this gasket is a practical upgrade.