Ultra HP 4412 Carb 2BBL 500 CFM

The Holley Ultra HP 4412 Carb 2BBL 500 CFM is a two-barrel carburetor designed for street and mild performance applications where fuel delivery precision and throttle response matter. Built for builders and enthusiasts who demand reliable cold-start performance and smooth idle characteristics without sacrificing drivability, this Holley carb delivers the blend of traditional carburetor simplicity with modern engineering.

At 500 CFM, this two-barrel design achieves optimal airflow velocity for engines in the 250–350 horsepower range, ensuring fuel atomization efficiency and preventing lean-out conditions during acceleration. The dual-barrel configuration provides independent fuel circuits for each throttle body, allowing progressive opening that enhances throttle control and reduces stumble off idle. Holley's proven metering block design incorporates adjustable mixture screws and idle feed restrictions, giving tuners the ability to dial in air-fuel ratios for local atmospheric conditions and fuel octane ratings.

The Ultra HP 4412 is ideal for those restoring classic muscle cars, tuning street rods, or upgrading older trucks. Its compact design and lightweight construction ensure that it fits well in most engine bays without excessive heat soak concerns. This carburetor provides a reliable foundation for consistent fuel metering across daily driving and weekend cruising scenarios.