To ride aboard the giant dual plane, a carburetor capable of 900+ cfm of airflow was necessary, but not of the racing variety. Ken Lazzeri swears by the Holley Pro Series List 4150, especially PN 80497. "The Pro Series vacuum secondary carb is super responsive," says Ken. "On a street car, you want controlled secondary response and that is what the vacuum secondary carb offers."However, if you needed large cfm air/fuel flow, you were out of luck as it came in sizes only up to 750cfm. Now, Holley has addressed that with this "made-for-strokers" 950cfm carb. The radiused venturies offering smooth airflow are what distinguish a Pro Series carburetor from other Holley list 4150s.