SKU: ALL 26183
UPC: 848238017311
MPN: ALL26183
The Base Plate Insert 1.100 4pk for 1/2in Spacer from Allstar Performance is a precision restrictor plate component designed for engine builders and race teams who need to regulate fuel delivery and airflow in high-performance applications. These aluminum inserts work in conjunction with 1/2-inch spacer plates to establish precise bore diameter restrictions, a critical element in sealed-engine racing formats and engine compliance specifications. Available as a four-pack, this product addresses the need for reliable, replaceable inserts that maintain consistent performance across multiple engines or provide spares for competitive racing operations.
Each insert features a 1.100-inch inner diameter machined to exact tolerances, ensuring repeatable flow characteristics and compliance with sanctioning body regulations. Constructed from aluminum in a natural finish, the inserts resist corrosion while remaining lightweight and cost-effective compared to solid billet alternatives. The four-piece configuration allows flexibility in setup changes, testing iterations, or maintaining multiple engine builds simultaneously. The inserts are engineered to sit securely within 1/2-inch spacer plates, creating a stable assembly that withstands combustion pressures and vibration typical of racing environments.
This four-pack is ideal for engine builders, race teams, and competitors in NASCAR, short-track, and other series that mandate restrictor-plate technology. Installation is straightforward—inserts nest into standard 1/2-inch spacer plates positioned between the carburetor or intake manifold and engine block. Because many sanctioned racing formats require periodic inspection and plate replacement, having spare inserts on hand ensures minimal downtime. Whether you're building a compliant street engine, maintaining a competitive race platform, or stocking a shop inventory, the Allstar Performance Base Plate Insert 1.100 4pk delivers the precision and reliability that serious builders demand.
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