AVS2 Series 650 CFM carburetor designed for optimum street performance on small-block and select big-block engines. This next-generation AVS2 design features annular-flow primary boosters that significantly improve fuel atomization, off-idle response, and part-throttle cruising performance while reducing flat spots during throttle transition.
Each annular booster uses eight equally spaced orifices to provide smoother fuel delivery from idle through the main circuit. The updated calibration makes this carburetor well suited for a wide range of street engines using either dual-plane or single-plane intake manifolds. Both timed and full-vacuum ports are provided for ignition advance tuning flexibility.
The carburetor is supplied with factory-installed electric choke and comes fully calibrated out of the box for typical street applications.
Factory calibration:
• Primary jet diameter: 0.101
• Secondary jet diameter: 0.098
• Metering rod size: 0.070 x 0.037
• Step-up spring force: 5" Hg (orange)
Key specifications
• 4-barrel carburetor
• 650 CFM airflow rating
• AVS2 Series
• Electric choke
• Square-bore flange
• Satin aluminum finish
• Primary bore: 1.44 in
• Secondary bore: 1.75 in
• Main venturi diameter: 1.19 in
• Body height: 3.25 in
• Gaskets included
• New, not remanufactured
Installation notes
• Compatible with Ford AOD transmissions when used with Lokar bracket SRK-4000
• Not calibrated for alcohol, race fuel, or E85; use will void warranty
• A new fuel filter between the fuel pump and carburetor is required
• Adapter #2732 may be required on certain intake manifold applications
