Don't remember the vaccum reading with the S/C on, but with the stock motor it's about 8-9 at idle and the boost on the 3L S/C was running 9PSI at 6000 RPM's of course then the motor had meltdown, but hey that's when the fun starts!

Rick

Owner of 00 #1611 Silver (Totalled) 98.5 T-Red SVT #6180 Buckshot77@msn.com Misc 3L parts for sale