Carb throat popping at speed, New Problem!!! Options

[LetoAtreides]

Ok, so I know I've posted this before, but I still cant figure it out, and I need to know all of the possible circumstances under which this condition occurs.

One of the throads on my dual carbs is excessively lout at speed. It sounds like pop-pop-pop.

Any ideas?

[r_towle]

well, its lean.
How it has become lean could be alot of things.

Start with the valves and make sure they are adjusted correctly.
Car will never tune without them set properly.
Also, make sure the manifolds are tight and leak free.
Make sure the carbs are properly synced and the exact same air/fuel mixture is going into each venturi...
How?
Remove the throttle linkage to start with..
Check each carb with a syncromter with the linkage removed.
This is when you use the air bleed screw on the bottom outside of webers to match each port to the same flow.
Do all four venturis with no linkage...they should draw exactly the same.

Then you re-install the linkage and sync two carbs to each other.

Other things to consider.
At speed you may be cruising but using the idle circuit only...or a blend of both the idle circuit and the main.
So, clean all the jets on that venturi..see if one or more are clogged and starving it for fuel.
check the float level on both carbs...make sure they match.

Finally, read the plugs...you need to learn how to read plugs properly to ensure you dont burn a valve.

Rich