4150 Ultra XP Carburetor 750CFM Methanol

The 4150 Ultra XP Carburetor 750CFM Methanol by Holley is purpose-built for serious racers and performance enthusiasts running methanol-fueled engines in competition and high-output street applications. This carburetor addresses a critical need in motorsports: reliable, consistent fuel delivery under extreme conditions where conventional gasoline carburetors fail. Whether you're tuning a drag racing engine, bracket racing platform, or dedicated alcohol burner, the 4150 Ultra XP delivers the precision metering and flow capacity required to support 750 cubic feet per minute of air volume.

The 4150 platform design provides Holley's proven four-barrel configuration with dual fuel bowls optimized for methanol's unique combustion characteristics and leaner jetting requirements compared to gasoline. The Ultra XP variant incorporates enhanced internal passages, precision-calibrated fuel metering circuits, and robust needle-and-seat assemblies rated for methanol's aggressive solvent properties and higher fuel flow demands. At 750 CFM, this carburetor delivers sufficient air capacity to support naturally aspirated engines in the 550–650 horsepower range while maintaining stable idle quality and precision throttle response essential for bracket racing consistency and lap-time repeatability on the street or track.

This carburetor suits builders upgrading from stock or undersized fuel delivery systems, carburetor enthusiasts preferring manual tuning control over EFI, and racers in classes restricting fuel injection technology. Installation requires a compatible four-barrel manifold and standard carburetor mounting hardware; verify your engine's fuel pump capacity and regulator specification for methanol service, as alcohol demands higher fuel pressure and volume than gasoline equivalents. The 4150 Ultra XP represents Holley's expertise in race-proven carburetor design, making it an essential upgrade for any serious methanol-burning engine program.