Phenolic 1in 4 Hole

The Mr. Gasket Phenolic 1in 4 Hole carburetor spacer is a precision thermal isolation component designed for street and performance engines seeking improved fuel atomization and cooler charge temperatures. Built for 4-hole square-bore carburetors, this spacer sits between your carb and intake manifold to create a critical air gap that reduces heat transfer from the engine block to the incoming fuel mixture. Whether you're tuning a street machine, classic cruiser, or weekend racer, a quality spacer is fundamental to carburetor performance and cold-start reliability.

Constructed from phenolic material—a composite resin engineered for thermal resistance—this 1-inch-thick spacer effectively insulates the carburetor from manifold heat while maintaining structural rigidity under engine vibration and thermal cycling. Phenolic's low thermal conductivity means fuel stays cooler and denser, promoting better vaporization and more complete combustion across your RPM band. The spacer includes gaskets and mounting hardware, eliminating the need for separate sourcing, and its black finish resists oxidation and engine bay contamination. At 1.39 lbs, it adds negligible weight while delivering measurable gains in throttle response and part-throttle drivability on naturally aspirated applications.

This Mr. Gasket carburetor spacer is ideal for builders and enthusiasts running square-bore four-barrel carburetors on big-block or small-block V8s, muscle car restorations, and street rods where intake manifold heat becomes a tuning bottleneck. Installation is straightforward: remove the carb, separate the old spacer (or gasket stack), bolt the phenolic spacer to the manifold studs, and remount your carb with fresh gaskets and fasteners—all included in the package. Verify your carburetor bore configuration and manifold bolt pattern before purchase to ensure compatibility with your engine platform.