teqdave

I recently purchased the connecting rod that goes from the servo to the throttle linkage. I was told it might not fit on a 4bbl. carb (mine is a 350 4bbl.) and 1) either I can't figure out how it goes on; 2) it is the wrong length; or 3) the bell crank is not correct for that carb. The picture below shows the bell crank that is on it now. Is it the correct one? The diagram in the assembly manual looks different. Does anyone have a picture of the cruise control linkage setup for a 72 350 4bbl?

I will appreciate any and all advice. Thanks.

throttle.jpg

Paladin31

I have the 72 assembly manual page and could email it if you like?
Brett

teqdave

Thanks, but I have that. The bell crank in that drawing doesn't quite look the same as mine. That is what has me puzzled.

Paladin31

Could you take. Couple more pics, one a little farther back showing the whole system, and a a front/rear facing shots of linkage. I have a couple cruise cara and setups that ID like to compare it too. And a few loose pieces that may illustrate a difference from standard. You can post them or email to me, paladin31@msn.com. Send as high res as you can.
Brett

teqdave

It will be tonight before I can take the pictures. I will e-mail you the hi-res pics and post some low-res in case it might help someone else. Thanks for your help.

Paladin31

My pleasure, it's what this is all about
Brett

teqdave

Here are some additional photos at different angles. Basically, I would like to know if the bell crank is correct for a 72 350 4bbl. with cruise control. I appreciate any and all comments.

Lady72nRob71

Here is how my 350 4bbl setup looks like. Dusty for the most part.........
The lever on the carb is correct for with or without cruise. What you need is the roller assembly that rides against the carb lever and connects to the servo rod.
Using the below and the pics in the assembly manual, you should be able to figure out the puzzle.






The carb itself...

teqdave

Rob,

Thanks! You answered my question, but now I have another. In the picture below, your roller assembly is mounted in the front hole but mine is mounted in the rear hole which is why it wasn't fitting properly. The post the assembly mounts on seems to be firmly attached. Any tips on moving it to the front hole?

teqdave

And by the way, what dust? I wish mine looked half that clean!

Lady72nRob71

The posts are actually cast in the intake manifold, if I am understanding correctly. Maybe a clearer picture will show how it all goes together...

One bolt is shared with the alt bracket and the other with the dashpot bracket.

The dust is the white speckles all over the black parts. Part of a 2000+ mile accumulation since the resto...

teqdave

Rob,

I think you misunderstood my response. Below shows my roller assembly on the left. It is mounted in the hole further back on the bracket. The rod appears to be riveted in place, but I hoping it wasn't and there was some "trick" to moving it to the front hole where yours is. If not, I guess I can grind off the rivet and figure out a way to re-mount it in the other hole. Any ideas?

teqdave

I guess I am an idiot. I just looked at the assembly manual again (for the 15th time) and saw that there were two different assemblies for 2bbl. and 4bbl. carburetors. I thought the difference was the rod length and not the roller assembly location on the bracket. I guess I will either have to keep looking or try to modify this part and move the roller assembly. Thanks.

Lady72nRob71

Yes I did misunderstand you, but now since I saw your roller unit, we are on the same page!
Is it possible to tap that peg out with a brass hammer and press (or pound) it into the front hole? I think they were pressed in, but I could be wrong.
Glad we have it figured out.

1001coins

do you still have that 2 barrel roller?

teqdave

I still have the part, but due to some luck and some goofy engineering, I was able to move the roller to the other hole. Unfortunately, now the shaft is a shade too long. This spring I will try to adjust the servo bracket to see if I move it back about 1/4 inch. It should fit then.

ELY442

Where did you purchased the connecting rod?

ELY442

Is that the original servo for your car? I need one for my 70 Cutlass.

teqdave

Ely,

I bought the entire roller assembly, including the connecting rod from OldsPackrat, who is a member of this site. Check with him to see if he has any more.

David

Lady72nRob71

Can you remove about 3/8" off the threaded end of the rod to shorten it? Leave the nut on it so it can reform the last thread after it is cut through.

That servo style is correct for my 1972..
A 1970 will use a different style servo.

teqdave

I thought about that, but the part that connects to the servo is already screwed down to the base of the threads on the rod. I don't think shortening the rod will help. If I continued the threads down a little and shortened the rod, that would work. I still think that by bending the servo bracket back just 1/4" will work, or just adding a few washers to the mounting bolts on the servo bracket. When it warms up a little, I will get serious about getting it on there. I'm sure there are several ways to skin the cat. Thanks for thinking about it!