This article begins by analyzing the performance difference in a 383 small-block when the standard 650-cfm carburetor is swapped with a Holley 750 HP. The first step was to establish a baseline on the K&N engine dyno so that the results of the swap could be compared. Once the baseline was established, the carburetors were swapped and the engine was dyno tested again. The results were not what they had expected.
To read the full Car Craft article and to see Holley carburetor tuning test results go to "How to Upgrade Your Favorite Holley Carb" on carcraft.com.