Would going from a 4.5 to 6.5 gain anything on my quickfuel 850Carb i going to change man the 76 jet to 74 to see if it will pick up the motor is 440 30 over stock 452 heads 509 cam m1 intake
FYI A power valve is simply that, a "valve" that is either open or closed, depending on the vacuum. The number determines at what vacuum reading the valve opens to richen the mixture when needed under load/accelleration. The amount of fuel flowing through a power valve doesn't change with the number it's rated at. It's to keep your plugs from loading up at idle and light cruising speeds.