AVS stands for air valve secondary, which describes the spring-loaded air-valve door. The Edelbrock carb uses a mechanical secondary but does not employ a secondary accelerator pump.

Edelbrock makes it easy to identify the AVS2 carburetor with its large tag on the front of the carb body. Otherwise, it looks the same, externally, as the previous AVS.

Overview. The next step up from our Performer Series® Carburetors is our Thunder Series AVS®. Designed and calibrated to deliver optimum street performance in hundreds of applications, Edelbrock Thunder Series AVS® Carbs are undeniably the most innovative and dependable street performance carburetors available today.

Edelbrock Crate Engines are built using the best quality parts from the block on up. Performance numbers are verified by Edelbrock engineers using state-of-the-art equipment. And unlike many crate engines on the market, nothing is reconditioned or rebuilt.

Air Valve Secondary Well, that is all about to change thanks to Edelbrock's new AVS2 carburetor. The AVS2 (Air Valve Secondary) is ideal for use in a wide variety of applications for both small-block and big-block engines. Some of the benefits of the AVS2 include: Crisp throttle response.

Make sure your fuel pressure does not exceed 6.0 psi, optimum pressure is 5.5 psi.

An Edelbrock Performer intake may add as much as 5-10 HP - after you fix what is actually limiting performance.

Industrial Opportunity Partners, LLCEdelbrock, LLC / Parent organization On June 7, 2010, the Chicago-based private equity firm Industrial Opportunity Partners (IOP) acquired Edelbrock Corporation.

Edelbrock, LLC is an American manufacturer of specialty automotive and motorcycle parts.

And unlike many crate engines on the market, Edelbrock Crate Engines are 100% brand new from the high-performance block on up. Nothing is reconditioned or rebuilt. That's why the best car builders across the country choose crate engines from Edelbrock, the company you can trust.

Basically, the AVS2 was designed to help your classic engine start quicker, run smoother, and allow for better low-end throttle response – all the benefits of EFI but without the electronics. When upgrading from a traditional down-leg booster carburetor, improved fuel economy is a definite positive!

6.5 psi Carburetor Fuel Pressure by Manufacturer