Base Plate Inserts .950 4pk for 1in spacer

The ALLSTAR PERFORMANCE Base Plate Inserts .950 4-pack for 1-inch spacer (SKU ALL 26061) is a precision-engineered set of aluminum restrictor plate inserts designed for high-performance engine builds requiring controlled airflow management. These inserts feature a 0.950-inch inner diameter and are manufactured from aircraft-grade aluminum in natural finish, providing the thermal and mechanical properties essential for sustained performance applications.

Each insert in this four-pack is precision-machined to tight tolerances, ensuring consistent fit and function when installed with a 1-inch spacer configuration. The 0.950-inch diameter opening is calculated to meter airflow precisely, a critical factor in carburetor and intake manifold setups where restrictor plates are used to regulate fuel and air mixture under varying load conditions. Natural aluminum finish resists corrosion in typical engine bay environments while remaining paintable for application-specific customization. The four-piece set provides redundancy and allows for testing across multiple applications or vehicles.

These ALLSTAR PERFORMANCE restrictor plate inserts are suited for circle track racing, street performance, and vintage muscle car restoration where fuel delivery management and carburetor calibration are critical tuning variables. Builders and engine tuners use restrictor plates to level competition fields in sanctioned racing or to meet specific performance parameters in street applications. Each insert weighs 0.39 lbs and measures 4.9 × 1.05 × 6.85 inches, fitting standard 1-inch spacer mounting configurations found across domestic performance engines.