570 CFM 4-Barrel Carburettor Vacuum Secondary. Manual Choke.

No Trouble quick change vacuum secondaries
Vacuum secondaries allow use on wide variety of vehicles
Dual feed fuel inlet
1 timed (spark) port, 2 full vacuum, and 1 PCV port
Ford A/T kickdown, does not work with A.O.D. transmissions
Intended for serious street enthusiasts. Calibrated for monster low-end torque, awesome acceleration, & unmatched top-end horsepower. Bolt on & go design
Manual choke