Base Plate Inserts 1.100 4pk for 1in Spacer

The ALLSTAR PERFORMANCE Base Plate Inserts 1.100 4pk for 1in Spacer (SKU ALL 26063) are precision-engineered aluminum restrictor plate inserts designed for engine builds that require flow-control modifications. These 1.100-inch ID inserts function as carburetor restrictor plates, a critical component in fuel-injected and carbureted engine applications where intake volume management is essential for compliance or performance tuning. Supplied as a four-pack in natural aluminum finish, this set provides redundancy and accommodation for multiple carburetor setups or engine configurations.

The 1.100-inch inside diameter specification defines the precise flow restriction these inserts provide when installed as part of a 1-inch spacer assembly. Aluminum construction delivers a lightweight, corrosion-resistant platform suitable for both street and competition engine environments. The natural finish requires proper installation technique and may benefit from protective sealing depending on operating conditions. Each insert maintains tight dimensional tolerances to ensure consistent air/fuel metering across multiple ignition events, critical for stable idle quality and transition response in carbureted systems.

This four-pack is ideal for engine builders, track enthusiasts, and restoration shops preparing vehicles for sanctioned competition or street driving where restrictor plate compliance is mandated. Racers frequently maintain spare sets to accommodate different competition rulebooks or to support multiple vehicles. The redundancy built into a four-pack protects against damage during installation or removal, common concerns when working with precision intake components. Compatibility with standard 1-inch spacer plates makes these inserts a direct fit for most domestic carbureted platforms.