CoretorTex 1" Phenolic Carburetor Spacer for Holley AFB & Edelbrock 4BBL — Open-Center, Insulating Kit with Gaskets & Hardware

CoretorTex 1" open-center phenolic carburetor spacer reduces heat transfer and improves throttle response for 4-barrel square-bore carburetors. The CoretorTex spacer is a one-inch-thick phenolic insulating adapter designed to fit square-bore 4-barrel carburetors such as Holley AFB and Edelbrock on small- and big-block Chevy and Ford 350 engines. Made to sit between the carburetor and intake manifold, this spacer helps isolate carburetor heat, protects fuel metering, and provides a consistent mounting flange with included gaskets and hardware for a complete install.

How does this spacer improve carburetor performance?

By adding a phenolic barrier between the hot intake and the carburetor base, the spacer reduces heat soak into the carb body. Cooler carburetor temperatures help maintain denser fuel charge and more stable air-fuel metering under load.

• One-inch phenolic thickness for effective thermal isolation
• Open-center design maintains airflow and reduces obstruction
• Helps stabilize idling and throttle response during extended use

Will this fit my Holley AFB or Edelbrock 4BBL carburetor?

The spacer is made for square-bore 4-barrel carburetors and lists compatibility with Holley AFB, Edelbrock, and many common SBC/BBC/BB/SB applications. Always verify bolt hole pattern, thread size, and physical dimensions before fitting to avoid misfitment.

• Fits square-bore 4BBL carburetors on Chevy and Ford engines
• M8 x 1.0 thread size for supplied bolts and hardware
• Confirm part shape, hole pattern, and 1" thickness against your carb and intake

What’s included and how hard is installation?

The CoretorTex kit arrives with the spacer, two gaskets and a bolt kit—enough to mount the carburetor securely. Installation is straightforward for anyone familiar with basic intake work; hand tools and proper torque specs are all that’s required.

• Includes: 1 phenolic spacer, 2 gaskets, 4 bolts, 4 washers, 4 nuts
• Standard hardware for M8 x 1.0 threaded applications
• Simple bolt-on install, check torque and gasket alignment during assembly

Are there precautions or fitment notes I should know?

Phenolic spacers are durable but can be damaged by overtightening or misalignment. Double-check the part photo, dimensions, and your carb/manifold thread type before purchase to ensure correct fitment.

• Verify bolt thread pitch and hole spacing against your carb and manifold
• Do not overtighten bolts—follow recommended torque for carb studs
• Inspect gaskets for alignment to prevent vacuum leaks or seepage

Who is this for This CoretorTex spacer is aimed at street rods, muscle-car owners, and performance hobbyists using square-bore 4-barrel carburetors who want an easy, cost-effective way to reduce heat-related carburetor issues. It’s ideal for mechanically inclined DIYers and professional technicians installing or upgrading carb setups on SBC, BBC, Ford 350, and other compatible 4BBL platforms who need a complete spacer-and-hardware solution in one purchase.

FAQ

Q: Does this spacer fit Holley AFB 4-barrel carburetors?

A: Yes—it's designed for square-bore 4BBL carbs like Holley AFB, but confirm bolt pattern and thread size before installing.

Q: Can I reuse my existing carb bolts with this spacer?

A: You can if they match M8 x 1.0 thread size; otherwise use the included bolts and hardware for proper fit.