ATM Innovation’s Gas XRB "race" carburetor is a step up from its XRSB series. While it shares many of the same features with the XRC, the XRB is intended for racers that frequently take apart their carburetors for precise tuning changes – the billet metering blocks and billet throttle bodies add another level of durability over die cast components. They also offer more race details like “slabbed” throttle shafts that promote smoother flow and less turbulence.

ATM’s XRB carbs use the ATM™ die cast aluminum carb body that has a fully contoured high-flow air horn and externally changeable idle- and high-speed air bleeds. When combined with ATM’s 2-circuit, 4-emulsion billet metering blocks with 4-corner idle adjustment, the XRSB becomes one of the most “tuneable” race carbs on the market. These billet metering blocks also have changeable idle fuel and power valve channel restrictions.

Dynamic fuel handling is important in hard-cornering racecars and ATM’s™ all aluminum dual inlet, dual sight-window fuel bowls were designed exactly for this purpose. They are fitted with 7/8”-20 inverted flare fittings for leak-resistant connections.

They are available in 5 sizes from 650-1050 CFM (4150 style).   

• ATM™ die cast aluminum main body w/changeable idle and high-speed air bleeds
• Billet 2-circuit, 4-emulsion metering blocks add durability for frequent calibration changes
• 4-corner idle adjustment
• ATM™ all aluminum dual inlet/dual sight-window fuel bowls
• Billet throttle body with slabbed throttle shafts
• Dual bolt pattern throttle-body (4150/4500)