Edelbrock’s Thunder Series AVS carbs have two new additions. The AVS2 Series 650 cfm have many of the features of the Performer and first-gen AVS models – a two-piece, all-aluminium construction for cooler operating temperatures and less warping; no gaskets below the fuel bowl level for fewer leaks; easily changed metering rods for precise tuning; and no plastic parts or power valves to blow out.

Edelbrock reckons what makes the AVS2 carbs better are the annular flow primary boosters with a new calibration for improved off idle and cruising performance. The downleg primary boosters used on many street carburettor designs simply provide fuel down the centre of the venturi.

The annular boosters used on the AVS2 feature eight equally spaced smaller holes for better fuel atomization. The improved fuel atomization eliminates flat spots when the carburettor transitions from idle to part throttle for better low RPM performance. You may even see an improvement in fuel economy. This video shows you how the annular booster design works.

SEE EDELBROCK’S AVS2 SERIES CARBURETORS AT SUMMIT RACING ENDS.