On Sunday, I replaced the Holley Street Avenger carb on my 71 383 RR w/727 slapstick with a new edelbrock 750. I went to hookup the factory stock one piece (71 and up style) kick down linkage and for some reason, after full adjustment is made at the top end of the rod, the throttle stud will not touch the back part of the oval hole in the top slide bracket when at idle. Because of this, the stud does not push the linkage back far enough for the kickdown to work during acceleration - it travels about an inch before it starts to push the slide bracket backwards. I didn't have this problem with the Holley, only with the Edelbrock. Is there a difference between big block and small block 71 and up one piece style factory linkage as far as length goes? Or is this a carb design difference in carb throttle bracket position? Any info is much appreciated!

Do you have the correct Mopar throttle lever extension (Edelbrock #1481) on that Edelbrock?

Are you running the Chrysler linkage adapter Edelbrock sells for these carbs? I have never had an issue using stock linkage with the adapter. There are different kick down rods between small and big block and even B to RB, the carb slide bracket I believe is the same length on the big block 4 bbl engines. Small block 2bbl cars do have a shorter one. Not sure on 4bbl setups.

EDIT: Beat me on the adapter John

Yes, I have the adapter installed - I should have mentioned that. I looked at it again and something just ain't right. Here's a picture, maybe it will help. There's about 3/4" of space at the rear of the slide bracket behind the throttle stud - there should be no space there.

Thanks everyone.

Is there an adjustable swivel at the transmission end of the rod?

Negative - the long rod has only one adjustment, at the top as you can see in the photo. The end that connects to the trans lever is solid and just clips on.

When I was getting help on here with setting up my kickdown linkage, lots of guys showed me how the just took 2 of those slotted bars and bolted them together to esentially make one long bar, so the the slot was properly sitting against the throttle pin at idle. Problem solved.

roe

I have the factory manifold and carb on my 440 and there is a spacer of about 1/2'. That linkage looks to be at a steeper down angle, and maybe raising the carb would help that some. The other thought is that the rod may have been bent to make it work with the old carb and may need to be bent back to work with this one.

Something doesn't look right, I don't think that should be angled down like that.

After you get this figured out your next questions will be about the carb , that one was a bad choice, many people have problems with that particular carb.

What is the original carb for that engine , thermobog or a holley ?

If it can fit, a spacer under that carb should help. I would help performance, and also give you a better angle for your kickdown linkage. I have a 1/2" spacer on mine.

I agree with the angle that it connects to the carb at is way to much. A factory thick gasket would even help.

The throttle cable bracket looks like it could be a 440 piece but it is hard to tell from the angle. A 383/400 one angles towards the carb more than a 440 one. The pic below shows 440 top and 383/400 bottom.

Also check the rod down to the transmission. Here is a 440 top and 383/400 bottom.

T2R9:
I think we are now getting somewhere on this. So there are different brackets between B and RB motors! OK, here's some more pics of my 383's linkage - I am not sure which set I have - can you tell from these pics?
Thanks

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Maybe a little late but it looks like u have the 440 bracket

It's not late - I'm still scratching my head on this! Based on the responses I've received above, we agree that the downward angle of the slide bar linkage is not right. Bee71Mopar inferred that 383 and 440 brackets are different, do you mean the height at which the throttle cable mounts is the difference? If so, then I would think that because the stroke/deck height on an RB motor is higher than a B motor, than the 383 bracket would be higher to compensate for the shorter stroke/deck height. If that's the case, then I probably do have the 383 bracket which is pushing the linkage up too high. I should then get a shorter 440 bracket??????? I want to say again that the kick down linkage,including adjustment and angle was perfect with the Holley carb and I only now have issues because of switching to the Edelbrock. The difference is with the carb - the throttle cable bracket on the carb must be set at a lower height than the Holley. Does anyone know this for sure?
Thanks again everyone!