Neoprene Holley Gaskets

MOROSO Neoprene Holley gaskets (part number 65223) are reusable metering block gaskets engineered for Holley 4150 and 4160 series carburetors. Constructed from neoprene material and precision-thickness engineered at 0.063 inches, this pair delivers reliable sealing performance across carburetor rebuild and restoration projects. These gaskets maintain dimensional stability under the thermal cycling and fuel exposure inherent to high-performance carburetor operation, making them an essential consumable for serious carb builders and engine builders working with classic American performance applications.

The 0.063-inch thickness specification is critical to proper Holley metering block sealing; gaskets thinner than this specification risk fuel leakage and unpredictable jetting, while gaskets thicker than specification can cause fitment issues and uneven sealing surfaces. Neoprene's chemical resistance to gasoline and its thermal tolerance (typically to 200–250°F) make it the standard material choice for fuel-system gaskets in carburetor applications where synthetic rubber provides superior durability compared to paper or cork alternatives. These gaskets come as a pair—one for each metering block side—ensuring both sides of the carburetor receive fresh sealing surfaces during rebuild, critical to consistent fuel delivery and tuning stability.

This pair is ideal for Holley 4150 and 4160 carburetor owners performing full rebuilds, upgrading to larger carburetors, or restoring vintage Mopar, Chevrolet, and Ford muscle car engine platforms that rely on these proven carb designs. Whether you're sorting out a classic street engine, vintage drag car, or restoration project, fresh neoprene metering block gaskets eliminate a common source of fuel-system leaks and tuning inconsistencies. MOROSO is recognized for producing precision gasket sets and engine sealing components trusted across the hot rod and restoration community.