I finally got the car back on the road after a yearlong hiatus. Prior to parking it a year ago, the motor had a real bad bog at WOT and one of the intake banks feeding the plugs looked lean compared to the other bank. So I pulled the carb, disassembled it and blew carb cleaner and compressed air through all orifices. I also noticed the transfer slots in the carb were completely covered up, so I adjusted the curb idle screw so that I had the correct exposed amount of transfer slots (per Holley manual). Put all back together, removed Bosch Platinum plugs and went with some Autolite 45s, and then I took it out for a spin today. The car ran like a raped ape with absolutely NO BOG
I noticed after the car warmed up and on the way home, the car would pop and backfire though the exhaust on deceleration. It was worse going down the hill, but also did is randomly on level ground. I've read some people claim it is due to a rich condition and fuel is getting into the exhaust and detonating. Is it as simple as adjusting the idle mixture screws?? I need to check but they are roughly 1 full turn out.
Below is my specs and settings
351w stock bore/crank/rods/pistons/heads
Duraspark dizzy, MSD superconductor 8.5mm plug wires, Autolite 45s @ 0.045" gap
Crane Hi-6 with LX-92 high energy coil
Timing set to 34° with 20° mechanical and 14° initial, all in by 3000
Aluminum dual plane intake
Holley Street Avenger 670cfm with stock 65/68 jets and idle set to 700rpm
Hooker Comp full length headers feeding into Magnaflow 2.5" stainless dual exhaust
Stock mechanical fuel pump
If you need other settings let me know.