Description NEW Quick fuel 600 CFM vacuum secondary black diamond series Superchager carburettors Features: Blower referenced Modified pumps and main circuits for supercharged application  vacuum secondaries allow use on wide variety of vehicles single feed fuel inlets Calibrated for excellent street/strip performance 1 boost reference port, 1 full vacuum, and 1 PCV port Performance upgrade mildly modified to highly modified vehicles Universal calibration for easy bolt-on performance Great for 2×4 set-ups where a 600 CFM is needed Adjustable float level no choke for better air flow Sold as a pair