427 SO help needed fustration setting in

[RICK LAKE]

Priobe There is no perfect number for A/F readings . Every motor is different,some run better rich while others like the lean side. For the most tork in a motor 12.4-12.7 is a good range to run. For max HP about 12.7 to 13.2 A/F readings. You are going to have to play with the timing also at the same time. The cam in your motor effects the webers alot more than a carb motor. All the throttle plate screws need to be at the same angle. You need a syncro meter that sits on the top of each throttle body and gives you an air flow reading, 2 of these would be better. What are your fuel pressure readings? You may have a lean out problem between the change over from the primary jet to the main jet. I am not a pro on this setup. The best thing would be to get the weber book at barnes and knoble book store and read it. When webers are running right, they will may 15-30 ft of torque and 20-40 hp more than a carb. Many article have been done on this. 12.7-13.2 is the ideal number for most stock cam motors, your needs a larger window to work in. 12.2 to 13.4. Cam is the big thing and overlap. That 14.7 read is the ideal A/F reading. If you try running this you would burn the motor up, on coasting or coming to a stop the number with FI is even higher but not at normal driving speeds. LM-1 meter will help alot, put you need to get the basic setup first. Syncro carbs first, then base idles mixture screws, then work on the cross over between primary to main fuel jets. I am not 100% how the tubes effect the A/F. Rick Lake