440 six-pack throttle issues

[cpojon]

I have a 70 Super Bee 440 4-speed and installed a new Edelbrock/Holley sixpack system. The car starts fine, runs down the road fine. When I nail it the motor really comes to life. No hesitation, no hic-cups, lots of power. My problem is the throttle hangs up and doesn't return to idle. The throttle return spring is doing its job fine and the throttle cable is not binding or hanging up. The throttle rod linkage to the outboard carbs are set according to the manual which states to unclip the linkage, close the outboard throttles and adjust the linkage in or out to match the rod with the holes on the carb. The throttle still won't return to idle. Should I adjust the outboard throttle rod out more to put as much pressure as I can to close the outboard carbs or should there be a little play in them? Any advice would be welcome. Thanks!

 

[Garys1969RR]

Meep Meep can prob help you here. He has experience with the 6 pak on a big block.

 

[6packMIKE]

If you manually open the throttle all the way does it stick?

 

[HEMI-ITIS]

If you manually open the throttle all the way does it stick?

With engine off of course:blob1:

 

[cpojon]

With engine off of course:blob1:

No, it appears to be closing.

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With engine off of course:blob1:[/

With the engine running, if I fully accelerate and then let off fully it stays open. When I pump the accelerator a couple times it comes down a little but not fully. I then reach with my hand and manually push the forward carb throttle ear and it returns to idle.

 

[HEMI-ITIS]

So,with engine not running you can put the pedal to the floor or manually open the throttle and it opens & closes with no sticking or binding?
I wonder if the blade is hitting the intake when at operating temp:tied up:

 

[cpojon]

So,with engine not running you can put the pedal to the floor or manually open the throttle and it opens & closes with no sticking or binding?
I wonder if the blade is hitting the intake when at operating temp:tied up:

I'll check the carb alignment at the intake again to see if its hanging up there. I checked that once but its worth another look,Thanks.

 

[HEMI-ITIS]

Check it "HOT",aluminum grows!

 

[Meep-Meep]

Your problem is most likely the outboard carbs not seating properly. You are on the right track. Un clip the rods but make sure they have just a bit of preload to hold the shafts tight when the center is set at the proper idle speed. And if you remove the carbs for jetting or whatever you will have to readjust them. Too many carbs crammed together this tight is a PITA to deal with!

 

[cpojon]

Your problem is most likely the outboard carbs not seating properly. You are on the right track. Un clip the rods but make sure they have just a bit of preload to hold the shafts tight when the center is set at the proper idle speed. And if you remove the carbs for jetting or whatever you will have to readjust them. Too many carbs crammed together this tight is a PITA to deal with![/QUOTE

Thank you for the advice.

 

[67 coronet]

drive it till it sticks.shut it down and pull the linkage from the carbs.if it is one carb missaligned then that one carb will still be stuck open.easy way to isolate the problem.

 

[Meep-Meep]

Do not drive with the safety linkage disconnected. If you do there is a high probability that the outboard carbs will stick wide open. Ask me how I know.

 

[Garys1969RR]

Do not drive with the safety linkage disconnected. If you do there is a high probability that the outboard carbs will stick wide open. Ask me how I know.

Oh man would that be a night mare! To have 4 barrels of a six pak wide open and not be able to shut it down? Wow. What did you do? Turn the key off ? I guess throwing it into neutral would probably blow up the motor! Lol

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Seems like on the first cars that had the key in the steering column, turning the key off would also lock the steering wheel.

 

[tallhair]

Oh man would that be a night mare! To have 4 barrels of a six pak wide open and not be able to shut it down? Wow. What did you do? Turn the key off ? I guess throwing it into neutral would probably blow up the motor! Lol

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Seems like on the first cars that had the key in the steering column, turning the key off would also lock the steering wheel.

Only if you turn it all the way off to pull out the key, if you just turn it enough to shut it off it shouldn't lock same as like modern cars.

I had a 70 sat convert w 383 stick wide open when the carb spring popped off during a wreck .. it was trying to climb over the concrete dividers at the time. The car had come to rest with the front half of the vehicle on top of the divider and rear wheels on the ground running wide open.

 

[Meep-Meep]

It was in the 80's in my buddies 69 Charger but I was there. He turned the key off. I now have that same 6 BBL set up and it's going on my 69 RR after I finish testing it on the Belvedere - with the linkage connected.

 

[cpojon]

Well fellas, I thank you all for your advice. I checked carb alignment, made sure the outboard carb butterflies weren't getting hung up on the manifold and made sure I had the vacum hoses attached correctly. Everything was as it should be. I went back to the outboard throttle rod linkage and kept adjusting to ensure full closure. Almost thought I had it too tight but that fixed it. WOW! Trial and error comes thru again. Nothing like the sound of that six-pack when it comes to life! Thanks again.

 

[HEMI-ITIS]

Bahwhaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

 

[cpojon]

Bahwhaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Something like that!

 

[tallhair]

Something like that!

Wanna post a vid of what that sounds like?