Base Plate Inserts 1.050 4pk for 1/2in Spacer

The Base Plate Inserts 1.050 4pk for 1/2in Spacer is a precision restrictor plate component designed for engine builders, racing enthusiasts, and performance shops working with advanced fuel system architecture. These aluminum inserts serve as critical flow-control elements in carbureted and fuel-injected engine builds, regulating fuel delivery and maintaining optimal fuel pressure across high-performance applications. Supplied as a set of four, this product addresses the need for reliable, repeatable restrictor specifications in both street and competition engine packages.

Manufactured from aluminum in a natural (uncoated) finish, these base plate inserts feature a 1.050-inch inside diameter that precisely meters fuel flow through your fuel system's restrictor plate assembly. The 1/2-inch spacer configuration ensures proper stack height and alignment within Allstar-specification restrictor plate systems, maintaining critical clearances and flow characteristics. Each insert is machined to tight tolerances, allowing builders to achieve consistent fuel pressure regulation and preventing surge or starvation across acceleration, cruising, and sustained high-load conditions. The natural aluminum construction offers excellent machinability for custom applications where bore sizing or flow tuning is required.

Professional engine builders, fabricators working with Allstar fuel system components, and racers optimizing carburetor fuel delivery will find these inserts essential for repeatable, precise fuel control. The four-pack allows for test-and-tune workflows or multiple build applications without repeat orders. Compatibility with 1/2-inch restrictor plate spacer systems makes installation straightforward for anyone familiar with fuel delivery assembly protocols. These inserts are particularly valuable in fuel cell-equipped vehicles, dual-carb setups, and regulated fuel systems where maintaining exact orifice size directly impacts engine response and reliability.