1in Billet Carb Spacer

The MOROSO 1in Billet Carb Spacer (MOR64991) is a precision-engineered intake manifold riser designed for carbureted engines seeking improved airflow dynamics and tuning flexibility. This one-inch aluminum spacer sits between your carburetor and intake manifold, creating additional plenum volume that enhances fuel atomization and distribution across all cylinders. Built for serious performance builders and street enthusiasts, the billet carb spacer addresses a fundamental challenge in carbureted engine tuning: optimizing the air-fuel mixture path from carburetor to combustion chambers.

Constructed from high-quality billet aluminum in natural finish, this spacer features a square-bore configuration with 1.696-inch bores and a four-hole bolt pattern that accommodates most standard carburetors and intake manifolds. The precision-machined design ensures zero runout and leak-free sealing, critical for maintaining proper fuel metering and preventing vacuum leaks that compromise performance. At 1.94 lbs, the spacer adds minimal weight while delivering measurable gains in mid-range torque through improved mixture distribution and velocity optimization. The one-inch thickness represents an optimal balance—enough volume to dampen carburetor fuel slosh and improve throttle response, without creating excessive heat soak or underhood clearance issues.

This MOROSO carb spacer is ideal for small-block and big-block muscle car builds, hot rods, and vintage truck restorations where every fraction of horsepower counts. Installation requires only basic hand tools and gasket surfaces; most builders report improved throttle response, sharper acceleration off idle, and noticeably smoother cruise characteristics. Verify your carburetor's base pattern—square-bore configuration matches holley-style carbs and aftermarket four-barrel carburetors—and confirm intake manifold bolt spacing before purchase. When paired with quality gaskets and proper carburetor tuning, the 1in billet carb spacer delivers repeatable performance improvements for both street and strip applications.