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Autolite 4100 Holley 4 Barrel Carburetor Spacer Plate for V8 Engine 260 289 302 351W with Edelbrock intake manifold. Has a vacuum port for PCV or Power Brakes - 1 inch spacer with 1 9/16 inch bore size holes. Made of 1/4 in. PCV - Plastic Phenolic. This spacer plate increases performance as runner length is increased as well as having a swirl in the spacer to increase torque. Note: Not for use with AVS Carburetors!