500CFM 2BBL Carb Gas W/ Hly Metering Blocks

The 500CFM 2BBL Carb Gas with Holley metering blocks represents a proven solution for street and mild performance builds seeking straightforward carburetor technology without electronic complexity. Built by Willys Carb, this two-barrel carburetor delivers dependable fuel atomization across light to moderate engine speeds, making it ideal for vintage restorations, economy builds, and applications where simplicity and reliability outweigh peak horsepower demands. At 500 CFM (cubic feet per minute), this carb matches well with stock to mildly modified small-block engines and is a natural fit for classic truck platforms and economy cars seeking adequate throttle response without excessive fuel consumption.

The integrated Holley metering blocks are the critical component here—they precisely control fuel delivery into both primary and secondary circuits by restricting flow through calibrated jets and channels. This design ensures consistent air-fuel ratios across the operating range, reducing flat spots during acceleration and preventing rich running conditions that plague poorly tuned two-barrels. The compact 11 x 9 x 12.9-inch footprint and 6.2-pound weight make installation straightforward on most manifold applications, while the traditional carburetor architecture allows field adjustments to idle mixture, float level, and metering rod position—critical tuning points that no driver should ignore during break-in.

Mechanics and enthusiasts restoring Chevrolet, Ford, and Mopar small-blocks benefit most from this design, particularly those working with 200–350 cubic-inch displacement where fuel economy and part availability matter as much as performance. The 500CFM 2BBL Carb Gas with Holley metering blocks excels on carburetor spacer platforms and works reliably with both mechanical and vacuum-operated chokes, depending on manifold configuration. Verify your intake manifold bolt pattern and height clearance before purchase; this unit is designed for standard two-barrel mounting, and proper gasket selection and carburetor synchronization during installation are essential for optimal drivability.