'70 Manual vs. '71 Auto Center Carbs?

[PurpleBeeper]

I've been trying to work through a rich idle situation with my 440+6 and I'm thinking about swapping out the center carb. My car is a '70 4-speed car and I have '70 4-speed 440 carburetors on it.

I have another set of '71 automatic 440 carbs. What is the difference between a '70 4spd center carb and a '71 auto center carb?

THANKS FOR YOUR HELP!

 

[biomedtechguy]

AFAIK, #63 jets for Auto, #64 jets for manual.

 

[Seventy]

Should work about the same, Ill buy all them extra 6 pack parts off ya, lol..

 

[62MAX]

I've been trying to work through a rich idle situation with my 440+6 and I'm thinking about swapping out the center carb. My car is a '70 4-speed car and I have '70 4-speed 440 carburetors on it.

I have another set of '71 automatic 440 carbs. What is the difference between a '70 4spd center carb and a '71 auto center carb?

THANKS FOR YOUR HELP!

If you have a rich idle,you have to address the end carbs,they also have idle circuits.

 

[PurpleBeeper]

If you have a rich idle,you have to address the end carbs,they also have idle circuits.

Thanks 62MAX. I've already been adjusting front/rear carbs and with the idle mixture screws turned all the way in (closed) on both the front and rear carb, the engine is still running rich.

 

[HerlitzGTX]

Check for a blown power valve.

 

[PurpleBeeper]

Good call HerlitzGTX, but I've already changed that out twice