1969 L46 Throttle Linkage

[Thomas C.]

I have 3 holes/choices for where the throttle linkage can attach. Any idea which one I should use? Also, where does the return spring attach on the bracket? On pictures I've seen of other people's cars (and in the AIM), there looks like there should be a dog-leg turndown on the bracket that my cable attaches to. In addition, it seems like my cable is bunching up back by the firewall like it's too long. Any advice is appreciated.

Tom

Carb.jpg
Carb2.jpg

[Joe L.]

Re: 1969 L46 Throttle Linkage

I have 3 holes/choices for where the throttle linkage can attach. Any idea which one I should use? Also, where does the return spring attach on the bracket? On pictures I've seen of other people's cars (and in the AIM), there looks like there should be a dog-leg turndown on the bracket that my cable attaches to. In addition, it seems like my cable is bunching up back by the firewall like it's too long. Any advice is appreciated.

Tom

[ATTACH=CONFIG]100951[/ATTACH]
[ATTACH=CONFIG]100952[/ATTACH]

Tom------


There were 2 different brackets used for the 1969 model year q-jet applications. The springs used for each bracket were specific to that bracket.

The first bracket was GM #3921611. This is the bracket you have. This bracket was used at least through mid-September, 1969. It is used with spring GM #3921680. I cannot determine if you have the correct spring. However, the spring you have is correctly mounted on both ends.

The second bracket was GM #3972625. This is the bracket with the lower extension for the spring mounting hole. It is used with spring GM #3972624. I do not know just when this bracket came into use but it was after mid-September, 1969.

[Thomas C.]

Re: 1969 L46 Throttle Linkage

Joe,

My car has a build date of October 22, so that's a few weeks later. Glad to know that my bracket could be the correct one. I've looked up the two different springs, and it appears that the one I have is correct for my bracket...although mine is looking a bit used.

What about the linkage? Is there a specific hole where it's supposed to attach? As you can see, I have 2 linkage connections on my carburetor....I'm not sure why that is, or which one the cable is supposed to attach to.

Tom

[Joe L.]

Re: 1969 L46 Throttle Linkage

Joe,

My car has a build date of October 22, so that's a few weeks later. Glad to know that my bracket could be the correct one. I've looked up the two different springs, and it appears that the one I have is correct for my bracket...although mine is looking a bit used.

What about the linkage? Is there a specific hole where it's supposed to attach? As you can see, I have 2 linkage connections on my carburetor....I'm not sure why that is, or which one the cable is supposed to attach to.

Tom

Tom-------


Your throttle cable is connected to a stud that is in the correct hole on the throttle lever. I don't know why the additional stud is present. It's not factory and was added by someone along the way.

[Michael L.]

Re: 1969 L46 Throttle Linkage

Here's a pic of my Sept 69 build L-46 4spd non-AC throttle linkage for what it's worth.

IMG_4683.jpg

[Jeffrey S.]

Re: 1969 L46 Throttle Linkage

Here is a photo of my October '68 300 HP with A/C car.
Jeff

[Thomas C.]

Re: 1969 L46 Throttle Linkage

Thanks guys. It looks like my linkage is a little different where the spring attaches. You both have 2 holes in the linkage whereas I only have one. Either my linkage is different or that extra piece has been cut off of mine at some point. Also, my spring has one longer side and one shorter side. I wonder if there was a change after September or if I have a modified linkage? My linkage has a 37250 stamp on the side. I see that Jeff's doesn't have that number and I can't read Michael's.

Also, it appears that your accelerator cables take a turn south after it clears the vacuum hose. I'll have to look again at mine and see why I seem to have an extra inch of cable that doesn't allow mine to make that smooth turn.

Tom

linkage.jpg

[Joe L.]

Re: 1969 L46 Throttle Linkage

Thanks guys. It looks like my linkage is a little different where the spring attaches. You both have 2 holes in the linkage whereas I only have one. Either my linkage is different or that extra piece has been cut off of mine at some point. Also, my spring has one longer side and one shorter side. I wonder if there was a change after September or if I have a modified linkage? My linkage has a 37250 stamp on the side. I see that Jeff's doesn't have that number and I can't read Michael's.

Also, it appears that your accelerator cables take a turn south after it clears the vacuum hose. I'll have to look again at mine and see why I seem to have an extra inch of cable that doesn't allow mine to make that smooth turn.

Tom

[ATTACH=CONFIG]100974[/ATTACH]

Tom------


I think the extension on the throttle lever has been cut off. I have no idea why. As currently configured, the throttle lever is not correct for any 1968-71 Corvette Q-Jet. I should have noticed this on one of your previous photos. What is the part number on this carburetor? It should be stamped on a flat boss on the rear of the float bowl ( right behind the black shield on your throttle cable).

[Thomas C.]

Re: 1969 L46 Throttle Linkage

07029207 2796

carb stamp.jpg

Tom

[Joe L.]

Re: 1969 L46 Throttle Linkage

07029207 2796

[ATTACH=CONFIG]100975[/ATTACH]

Tom

Tom------


It's the correct part number for your application. However, it was manufactured on October 5, 1976. So, it's a SERVICE carburetor. SERVICE carburetors may differ from original carburetors in minor ways. As a matter of fact, this particular carburetor part number, 7029207, was used as a SERVICE carburetor for many applications for many years.

[David M.]

Re: 1969 L46 Throttle Linkage

https://cliffshighperformance.com/articles/quadrajet-casting-number-chart

Here is how to decode a Q-Jet.

Adjust the clamp on the carb so its parallel and push the cable towards the front of the car you will gain a little bit there. Also inspect where it goes through the firewall. There is a little left right tweaking there. Then go under the dash and inspect for anything out of whack. After 50 years there is a lot of things that could be "not right".

So your car is right on the cusp of early vs late 69 on the throttle cable design. If the bell crank looks like this(see pic) its early. Inspect it closely where the gas pedal rod clamps to the bell crank under the dash. It can wallow and become lose. The later design happened for good reason. Im dealing with an early 69 with throttle cable issues as we type.

[Thomas C.]

Re: 1969 L46 Throttle Linkage

Does the zero in front of it make it a service carburetor?

[Joe L.]

Re: 1969 L46 Throttle Linkage

Does the zero in front of it make it a service carburetor?

Tom------


Sort of. The leading "0" for the part number was added after Rochester went to the 8 digit part number system. However, the thing that makes this a SERVICE carburetor is the fact that it was manufactured 7 years after your car was built. In addition, no PRODUCTION application in 1976, the year this carburetor was manufactured, utilized this carburetor. So, it had to have started life as a SERVICE carburetor.

[Thomas C.]

Re: 1969 L46 Throttle Linkage

Thanks for that input. It appears that I have the late design accelerator petal. I'll try to contort my old bones to see if something is amiss under the dash.

I guess I'll go searching for a correct carburetor. Wish I had a spare kidney to sell. Heck, if it weren't for people owning my car, it'd be darn-near perfect. :-)

Tom

[Mark E.]

Re: 1969 L46 Throttle Linkage

Thomas,

I have a 7029207 dated 1308 that's been hanging on my garage wall for years. PM if you're interested. It has linkage similar to Michael's and Jeffery's photos.

What's interesting is I have several 7040205/7040505 (1970 454 4-speed) Q-Jets, and their linkage and spring attachment looks like what Thomas is using. I never noticed this difference between years before.