750 CFM 4150 HP Carb Double Pumper Methanol

The Holley 750 CFM 4150 HP Carb Double Pumper Methanol is a purpose-built four-barrel carburetor engineered for high-performance racing and competition applications where methanol fuel systems demand precision fuel delivery and reliable atomization. This classic 4150-series carb is designed for engines requiring serious fuel flow control under aggressive throttle input, making it the choice of racers and performance shops building dedicated competition powerplants. The double pumper configuration delivers instantaneous fuel response, eliminating hesitation and ensuring consistent combustion across the full RPM band.

Constructed from aluminum with a black anodized and gold chromate finish for corrosion resistance and durability in harsh track environments, this carb features mechanical secondary operation with dual inlet ports optimized for methanol's higher flow rate and cooling properties. The square bore design ensures uniform air velocity and fuel distribution across all four barrels, critical for methanol engines where lean-out conditions and detonation risk demand precision calibration. At 750 cubic feet per minute displacement rating, this unit accommodates engines in the 400–500 horsepower range typical of bracket racing, circle track, and drag racing platforms where no choke operation simplifies cold-start procedures and reduces component complexity.

Engine builders and racers benefit most from this carb's ability to deliver the volumetric air requirements of high-revving methanol-burning engines without fuel starvation or overflow issues common in lesser designs. Installation requires a carburetor spacer matched to your intake manifold's bore configuration and compatible fuel system hardline routing for methanol compatibility—standard gasoline fuel systems are not recommended due to methanol's solvent properties. This classic platform accepts Holley jet and needle configurations, allowing tuners to dial in jetting precisely for their specific engine combination, altitude, and methanol blend, ensuring optimal power delivery and fuel efficiency on race day.