Carburetor 750CFM Circle Track E85 Mech. Sec.

The Carburetor 750CFM Circle Track E85 Mech. Sec. by PROFORM is a purpose-built fuel delivery system engineered for high-performance circle track racing applications where ethanol-based fuel chemistry demands specialized tuning. This 750 cubic feet per minute (CFM) carburetor addresses the unique requirements of E85 fuel—which burns cooler and requires richer air-fuel mixtures than conventional gasoline—making it an essential upgrade for competitors seeking reliable, repeatable performance on short-track circuits. Built by PROFORM, a leader in race carburetor development, this unit delivers the flow capacity and mechanical control needed for consistent lap times.

The carburetor features a square-bore four-barrel design with dual inlet ports, mechanical secondary activation, and black anodized aluminum construction combined with tumble-polished accents for durability and corrosion resistance in demanding race environments. Mechanical secondary operation eliminates dependence on vacuum signals, providing direct throttle-blade linkage that responds instantly to driver input—critical for circle track racing where split-second fuel delivery adjustments affect both acceleration out of turns and mid-corner stability. The no-choke configuration and E85 calibration eliminate cold-start complexity while optimizing jetting and needle positioning for ethanol's oxygen content and combustion characteristics, ensuring consistent fuel atomization across the RPM band.

Circle track racers running E85 fuel systems—particularly in oval track classes where fuel choice impacts competitiveness—will find this carburetor's 750 CFM capacity matches small-block and mid-sized engine platforms common in regional short-track competition. Installation requires a square-bore intake manifold and fuel supply system rated for E85 compatibility; proper jetting and float-level adjustment during dyno tuning ensures optimal performance for your specific engine displacement and track conditions. At 9.25 lbs with compact 11.3 x 7.6 x 13.4-inch dimensions, this unit integrates into tight engine bay configurations without weight penalty.