Another carb help...

[Kalums]

So... I've got an Edelbrock 1406 that replaced the original QuadraJet ( I didn't do it, it came this way) I rebuilt the 1406...runs amazing, but I get significant rpm drop when I put it in gear (stalling) . Cold or hot it doesn't matter. What gives? I've done a complete tune up, plugs AcDelco R45ts (gapped to 45) new MSD 8mm wires(I know that means insulation) the HEI is a Delco and it is putting out about 15k volts on each lead and wire at the plug(zapped myself a few times testing... Ouch) timing is set to 12 dgrs advanced @ 800 rpm idle. Choke is electric and appears to be working/functional (choke flap is opening slowly as it warms)Vacuum gauge shows good vacuum hot or cold. My vacuum advance is connected to the vacuum port on the passenger side of the carb(swapping to driver's side port only increases in park idle speed) . I've sprayed carb cleaner on ever crack crevice and hose, I can't find a leak if there is one. Everything is set up per the Edelbrock set-up guide and everything I can find from the Google overlords. What am I missing?

[geezer#99]

Turn your idle down to 600 rpm.
Then check your timing.
At 800 rpm the mechanical timing might be kicking in,

[Kalums]

Originally Posted by geezer#99

Turn your idle down to 600 rpm.
Then check your timing.
At 800 rpm the mechanical timing might be kicking in,

Thank you, I will try that👍

Tried this morning... No go, still does the same thing.

[Wrenchbender Ret]

Try it with the vacuum advance disconnected.

George

[geezer#99]

Originally Posted by Kalums

Thank you, I will try that👍

Tried this morning... No go, still does the same thing.

So at 600 rpm, what was your timing?

[leftybass209]

Originally Posted by Kalums

So... I've got an Edelbrock 1406 that replaced the original QuadraJet ( I didn't do it, it came this way) I rebuilt the 1406...runs amazing

Did it have these symptoms before you rebuilt the Edelbrock?

is it the original cast iron manifold with a carb adapter, or is it a square bore intake manifold?

Where do you have the idle mixture screws set, and do they actually change the vacuum signal/idle speed when you run them in/out?

[GASoline71]

Originally Posted by leftybass209

Did it have these symptoms before you rebuilt the Edelbrock?

is it the original cast iron manifold with a carb adapter, or is it a square bore intake manifold?

Where do you have the idle mixture screws set, and do they actually change the vacuum signal/idle speed when you run them in/out?

Those spread bore to square bore adapters are notorious for air/vacuum leaks.

Gary