TRUCK AVENGER PERFORMANCE CARBURETORS These square-bore carburetor are the best thing to happen to off-road trucks since four-wheel-drive! Unbelievable performance while hill climbing, off-roading, heavy-duty towing or mud bogging! No flooding, no hesitation, no stalls during extreme inclines/descents-;conventional truck carbs can't compare! Recommended for stock engines and engines up to 500 horsepower. Annular booster for incredible low- and mid-range throttle response and torque. Designed for off-road riggors but equally effective on the street! Single fuel inlet banjo fitting for bolt-on-and-go ease. Exclusive dichromate finish looks great, lasts longer and requires less maintenance than polished finish. Square fuel bowls for precise fuel control.No Trouble™ Features Guarantee Top Bolt-on-and-Go Performance!Adjustable Vacuum Secondaries. One-minute adjustments for 6% more acceleration, 5% better fuel economy. Tunable from mild to wild.Electric Choke. Effortless on-vehicle adjustments for easiest cold starts and smoother idle. No over-adjustments...;ever!Four Vacuum Ports. Ports for PCV, spark, power brake and vacuum accessories simplify installation and ensure great street performance.Exclusive Metering Block. No fuel spillover through boosters during extreme travel! Ensures flood-free operation during 40° climbs and during 30° side-hill maneuvers and descents.One-Piece Vent Tube. No fuel spillover from vent tubes during wild ups and downs. Click on the SKU for more detail information.