950 CFM puts this squarely in race territory, where the engine has the displacement and rpm to actually use the airflow. It carries four corner idle adjustment and 50cc accelerator pump wells, both of which exist because a race engine idles and transitions differently than a street one, and the 4150 and 4500 flange compatibility means it adapts across manifold styles.

Edelbrock 1309 VRS-4150 Carburetor Specifications:

• 950 CFM rating, four barrel, 1.750 in. bore diameter.
• Annular boosters, 50cc accelerator pump wells.
• Fits 4150 and 4500 flange patterns.
• 3.75 in. body height, bead blast finish.
• Gaskets included. Race and performance application rather than a stock replacement.