Duane Sorry it's taken me so long but just got out of work. My problem was I had to much fuel line pressure almost 7 and most rochester carbs work best at 3 to 5 psi. With to much pressure it pushed the float valve open. I brought mine down to 5 psi and it worked better, but with my new cam and high gears I just couldn't dial it in right so I have it on E-Bay now for sale. Went back to a 600 cfm 4 barrel and have no problems. I didn't really adjust my float valve as the high pressure was keeping it open. Bart