Metering Block Kit

The Holley Metering Block Kit (model 34-13S) is a precision fuel delivery component designed for secondary circuit carburetor tuning on Holley 4160 carburetors. This aluminum metering block manages fuel flow to the secondary barrels, controlling the transition and high-speed enrichment characteristics that determine how your carburetor supplies fuel under acceleration and load. Complete with gaskets and hardware, this kit delivers everything needed for a proper secondary metering installation or replacement.

The silver-finished aluminum construction resists corrosion while maintaining the dimensional precision required for reliable fuel metering. At 1.11 lbs and measuring 7.45 x 1.05 x 10.65 inches, the metering block integrates seamlessly into Holley 4160 applications. As a secondary metering block, this component works in tandem with the primary metering system to supply enriched fuel once the secondary throttle opens. Proper secondary metering is critical to preventing flat spots, stumbling, or excess fuel consumption during part-throttle and wide-open throttle operation. The included gaskets and hardware eliminate the need to source components separately, streamlining installation and reducing the risk of leaks from mismatched gasket materials.

Street performance builders, classic car restorers, and carbureted engine tuners rely on metering block kits to dial in fuel delivery for consistent power across the RPM range. Whether troubleshooting lean-condition hesitation, addressing flooding from worn secondary metering orifices, or upgrading to a fresh OEM-equivalent component, this Holley secondary metering block kit provides OEM-quality parts from a brand trusted in carbureted performance for decades. Compatibility with Holley 4160 four-barrel carburetors makes this an essential rebuild or upgrade component for anyone maintaining or restoring a carburetor-fed engine.