Carburetor Spacer - 4150 1.5in 4-Hole L/W Tapered

The Carburetor Spacer - 4150 1.5in 4-Hole L/W Tapered from Wilson Manifolds is a precision intake manifold spacer engineered for carbureted engine builders and performance enthusiasts seeking improved air charge cooling and manifold tuning flexibility. This lightweight spacer inserts between your 4150-pattern carburetor and intake manifold, creating a thermal barrier that reduces heat soak while allowing fine-tuning of fuel atomization and air velocity through the plenum. Whether you're assembling a street rod, classic muscle car, or competition engine, this spacer addresses a fundamental challenge: optimizing the intake tract without sacrificing carburetor mounting security or manifold compatibility.

Manufactured with a tapered design, the 1.5-inch height creates a controlled flow path that encourages more even fuel distribution across all four intake runners while the tapered geometry reduces restriction and turbulence common in standard spacers. The four-hole configuration matches the industry-standard 4150 carburetor flange, ensuring rock-solid mounting without modification to your existing carburetor or manifold. Weighing just 0.98 pounds, the lightweight construction minimizes parasitic mass while the tapered profile preserves intake velocity—critical for carbureted engines where airflow dynamics directly impact throttle response and part-throttle drivability. This design allows builders to experiment with spacer thickness and taper angles to dial in optimal performance for their specific engine displacement, cam profile, and intended use.

High-performance carbureted engines—from naturally aspirated street builds to vintage race applications—benefit most from this spacer's thermal insulation and flow characteristics. Installation is straightforward: simply unbolt your carburetor, position the spacer on the manifold studs, reinstall the carburetor, and torque to spec using a cross pattern. This Carburetor Spacer - 4150 1.5in 4-Hole L/W Tapered works with any intake manifold accepting 4150-pattern carburetors, making it a versatile tuning tool for Chevrolet small-blocks, big-blocks, Ford Windsor engines, and other platforms running conventional four-hole flange carburetors. Recommended for builders prioritizing fuel economy, drivability, and manifold air temperature (MAT) control in street-driven or competition carbureted powerplants.