Checked timing on 440. Now what could be the cause?

[Coach420]

I recently purchased a restored 1969 GTX and when I floor the accelerator at low rpms there is a bog/hesitation. The car has a MSD Pro Billet distributor so I looked at the mechanical advance springs and they are the light silver ones (quick advance). I then checked timing which read 17 degrees at idle and 37 degrees total. So I think I've ruled out timing. What next? The Carter AFB carburetor is rebuilt and looks like new - maybe it needs adjustment? Appreciate your thoughts!

 

[khryslerkid]

Look into the carb, pull back on the throttle and see if it's getting a good shot from the squirters.

 

[Ranger16]

when I floor the accelerator at low rpms there is a bog/hesitation.

Yeah, that's usually a sign of a bad accelerator pump. Follow the Kids advice.

 

[Kern Dog]

There needs to be a movement of fuel immediately after the throttle blades start moving.

 

[747mopar]

Agreed, timing usually just causes them to be a slug off the line not bogging.

 

[727]

If you stab the throttle too fast on a properly working carb you may get a bog. Do you have the stock cam for that GTX? A hotter cam can give up some bottom end.
Quadrajetparts.com has just about any part you may need for that carb. Don't be afraid to install an accelerator squirter nozzle smaller than the original. Good luck with your search!

 

[Coach420]

Thanks for your help. I'll start by following the instructions on page 11 of http://www.mymopar.com/downloads/Carter_AFB_AVS_Service_Manual.pdf

 

[Coach420]

Thanks for your help. I'll start by following the instructions on page 11 of http://www.mymopar.com/downloads/Carter_AFB_AVS_Service_Manual.pdf

Also here http://www.mymopar.com/downloads/carterafbtuning.pdf at pages 19 and 33

 

[Cranky]

If you stab the throttle too fast on a properly working carb you may get a bog. Do you have the stock cam for that GTX? A hotter cam can give up some bottom end.
Quadrajetparts.com has just about any part you may need for that carb. Don't be afraid to install an accelerator squirter nozzle smaller than the original. Good luck with your search!

The only carb that ever did that to me was a TQ and only did it when the car had perfect traction off the line and then it was just a very quick (less than a 1/2 second?) balk then it moved very well. No hiccup or pop. The air door needed to be tweaked a bit but on the road, it would just blow off the rear tires right at the hit so it did just fine on the street. It didn't even show up until at the track with slicks. I'm thinking with the OP's carb, the squirters are not working good enough to cover up the lean condition at throttle opening.