Which setup would be best to make 10lb or more on a built 383. Vortech say's the originals are 3.33 and 6 inch w/ 8 ribs. He said go w/ a 2.75 and stay w/ 6 inch crank. I was told by a pully comp. to use a 7 inch and 2.75 or 2.95?? Those that have been down this road, your input would be appreciated. Thanks

 

I have seen 11-12 psi on a built 383 through an aftercooler with the 7"crank 3.1 blower pulley setup. 10 PSI if shifting at 6200..Aftercoler only had around 1 psi pressure drop.