Metering Block Kit

The Holley Metering Block Kit (model 34-13S) is a precision fuel delivery component designed for carbureted engine builds and modifications. This OEM-quality metering block is essential for anyone rebuilding or upgrading a Holley carburetor system, whether for classic muscle cars, street rods, or modified engines aiming for improved fuel economy.

As a metering block assembly, this component houses the main jets, needle seats, and fuel distribution passages that meter gasoline into the carburetor's primary and secondary circuits. The precision-machined aluminum construction ensures tight tolerances critical for accurate fuel atomization and mixture control, directly affecting throttle response and maximum horsepower delivery. Holley's engineering maintains dimensional accuracy across production batches, allowing seamless integration with existing carburetor bodies.

This kit is particularly beneficial for vintage car restorers, performance tuners, and DIY mechanics who are rebuilding Holley-based carburetors, serving as a complete replacement or upgrade path. Installation requires carburetor removal and basic disassembly; all necessary gaskets and seals are included to ensure proper sealing and function.