[old5.0]

Yeah, I'm plenty familiar with Kenne Bell. I mean that while the Kenne Bell screw blowers enjoyed some popularity early on with the Mustang crowd, they were largely supplanted by the Paxton and Vortech centri blowers in competition by the mid-90s. They enjoyed a resurgence on the smaller displacement OHC cars beginning in the early 2000s. Centrifugals and turbos are still the weapons of choice on pushrod cars. As far as I know, KB doesnt even make a blower for a pushrod sbf any more. The "Screw vs. Centri vs. Turbo" war was a big deal in the Mustang world 20 some years ago, and the screw blowers were largely pushed aside until the Modular engines started showing up at the tracks in large numbers.