Carb Insert 1in Tall 1.125in Diameter

The Carb Insert 1in Tall 1.125in Diameter from Wehrs Machine is a precision-engineered restrictor plate insert designed for carburetors requiring flow control or displacement matching in competitive or street-performance applications. Built for mechanics and engine builders who demand exact bore sizing, this aluminum spacer delivers the bore geometry needed to optimize fuel-air mixture distribution and maintain consistent jetting across different engine configurations. Whether you're tuning for bracket racing, oval-track competition, or street cruiser consistency, this carburetor insert provides the baseline flow restriction necessary for proper fuel economy and performance balance.

Machined from aluminum in a natural finish, the Wehrs Machine restrictor plate insert measures 1 inch tall with a precisely bored 1.125-inch diameter opening, meeting exact OEM or sanctioning-body specifications. The 1.125-inch bore diameter is critical—it controls air velocity and metering precisely, preventing rich or lean conditions that plague oversized carburetors on smaller-displacement engines. Aluminum construction keeps weight minimal while offering durability under thermal cycling and repeated use. The spacer-system design allows straightforward installation between carburetor and manifold without permanent modification, making it ideal for testing jetting changes or meeting tech inspection requirements at the track.

Engine builders, bracket racers, and circle-track competitors rely on this insert when pairing a larger carburetor with smaller-displacement engines, or when tech rules mandate flow restriction. Installation is straightforward—position between the carburetor base and intake manifold, torque fasteners evenly, and confirm gasket sealing. The lightweight design (0.56 lbs) adds negligible inertial load while the 1.125-inch bore is compatible with standard Holley, Edelbrock, and Carter four-barrel carburetors. Verify your manifold's carburetor mounting surface and gasket compatibility before ordering to ensure a leak-free seal.