Metering Block Gaskets

Metering block gaskets are essential sealing components for Holley 4180 carburetors and similar fuel delivery systems. These composite gaskets prevent fuel and air leaks at the metering block interface, where critical fuel metering circuits meet the main carburetor body. If you're running a performance carb on a street engine, race platform, or restoration project, worn or damaged metering block gaskets will cause fuel weeping, inconsistent jetting response, and difficulty dialing in your air-fuel mixture—making them a must-have replacement item for any serious tuner or mechanic.

These Holley metering block gaskets measure 0.063 inches thick and are engineered from durable composite material to withstand fuel exposure and thermal cycling without degradation. Composite construction provides superior chemical resistance compared to cork or rubber alternatives, ensuring a reliable long-term seal even under high-heat engine bay conditions. The precision-cut gasket design matches the exact port pattern and fuel passage geometry of the metering block, guaranteeing proper alignment with fuel jets, idle circuits, and emulsion tubes. Each pair (two gaskets) gives you a complete replacement kit—eliminating the common mistake of reusing old gaskets during reassembly.

These gaskets are ideal for carburetor rebuilds, performance tuning, and any situation where you've removed the metering block for inspection or adjustment. Whether you're diagnosing a lean stumble, replacing worn fuel metering components, or performing a full carb restoration, fresh gaskets are non-negotiable—they cost pennies and prevent expensive fuel leaks or uncontrolled mixture changes. Installation is straightforward: simply position the gasket pair during metering block reassembly and torque evenly to secure a tight, fuel-proof seal. Compatible with Holley 4180 carburetors and related Holley performance carburetor platforms.