Carb Spacer 4150 Open 1.00in

The Carb Spacer 4150 Open 1.00in from ALLSTAR PERFORMANCE is a precision carburetor spacer designed for serious enthusiasts building high-flow induction systems. Built to accommodate square-bore four-barrel carburetors with a 4150 flange pattern, this 1-inch thick open design sits between your carburetor and intake manifold to optimize fuel atomization and air velocity characteristics. Whether you're tuning a street machine, drag racing platform, or performance street rod, this spacer addresses real flow dynamics that directly impact throttle response and fuel distribution across all engine speeds.

Constructed from durable plastic in a professional gray finish, the Carb Spacer 4150 Open features an open-chamber design that maintains maximum flow potential while creating beneficial air-velocity effects in the intake tract. The 1-inch thickness provides critical distance for secondary fuel distribution without restricting primary bores—a key engineering detail that separates quality spacers from inferior alternatives. This design principle allows fuel droplets to break apart more effectively, reducing wall-wetting and ensuring cleaner combustion across the RPM band, which translates to more consistent jetting and better part-throttle drivability.

Professionals and dedicated hot rodders choose this spacer when restoring carburetor performance or upgrading existing induction systems. Installation requires gaskets and fasteners compatible with your specific 4150-pattern carburetor and intake manifold combination; verify your manifold accepts open-style spacers, as some closed designs mandate sealed units. At 0.89 lbs with compact dimensions, it installs quickly and pairs seamlessly with standard square-bore carburetors, making it ideal for Holley, Edelbrock, and similar aftermarket platforms where flow optimization matters.