Base Plate Insert .950 4pk for 1/2in Spacer

The ALLSTAR PERFORMANCE Base Plate Insert .950 4pk for 1/2in Spacer (SKU: ALL 26181) is a set of four aluminum restrictor plate inserts engineered for motorsports engine regulation and competition fuel system control. These base plate inserts feature a 0.950-inch inner diameter and are designed specifically to work with 1/2-inch spacer configurations, making them a direct fit replacement or upgrade component for fuel injection systems requiring fixed air restriction compliance.

Each insert is manufactured from aluminum in natural finish, providing a lightweight yet rigid platform for consistent fuel metering under varying engine loads and fuel pressures. The 0.950-inch orifice opening is precision-sized to maintain fuel flow rates within sanctioned competition parameters, where fuel restrictor regulations enforce standardized engine performance ceilings across competitive classes. The four-pack quantity ensures redundancy and replacement availability for maintenance cycles or multiple vehicle applications. Weight at 0.24 lbs per pack reflects the aluminum construction's inherent lightness, a critical consideration in high-performance builds where component mass directly impacts overall engine efficiency and response.

This base plate insert set serves oval track racing, drag racing, and bracket racing competitors who operate under fuel system regulation mandates. ALLSTAR PERFORMANCE is recognized throughout motorsports as a supplier of competition-grade fuel system components and restrictor technologies. These inserts are compatible with fuel injection base plate assemblies requiring 1/2-inch spacer mounting and 0.950-inch diameter openings. Competitors, engine builders, and shop technicians rely on matched restrictor sets to maintain baseline fuel delivery and ensure repeatable, legal performance across multiple events and tuning sessions.