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Topic: Throttle link question

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Throttle link question (1/13)
9/19/13 3:14pm

kevmcrae
Former Member
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Kalispell, MT - USA

Vette(s):
1969 427 sport coupe, Monza Red, matching numbers, all original.

Joined: 2/28/2013
Posts: 10

Hi All,

New to the forum and a first time Vette owner! Smile

I have an early production 1969 427 390hp with the quadra jet four barrel. The Accelerator cable was freyed so ordered a NOS GM. My issue is the end that connects to the carb is different. My carb linkage has a flat stud with a clip to hold the cable on. Cable has been modified by someone by soldering a regular round wire connector to the end. (that's probably what started the freying). It slips over the stud then the clip goes on to hold it there. The new cable has a fitting on the end that is supposed to clip over a ball stud. I ordered a ball stud to replace the flat stud thinking screw the old one off and put the new one on. But the old flat stud appears to be permanently attached to the linkage. Do I just grind it off?

Also, it looks like the cable is about 1/2 inch or so longer on the new one! (maybe that's why the old one was cut off and the end soldered on?) I've got the clamp as far forward on the cable jacket as possible. Now thinking I may have to bend the gas pedal lever rod to take up the slack?

Has anyone ever seen this before? Should I have a ball stud on the carb in the first place? Could that be a sign that it's not the original carb?

Thanks

Kev

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Re: Throttle link question (2/13)
9/19/13 5:07pm

rraider1
Former Member
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1165

I would suspect that some where along the line the carb has been replaced which has the linkage setup from 75 to 81. I believe their is only three options for accelerator cables 1968-73, 1974, 1975-81 75 to 81 use the round eyelet end 68 t0 74 use the ball end.

Do you have the numbers from the carb or a picture of the linkage setup here is a picture of the 68-73

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Re: Throttle link question (3/13)
9/19/13 5:34pm

rraider1
Former Member
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1165

If I looked up the carb correctly 7029204 Auto 7029215 MT for 69 427

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Re: Throttle link question (4/13)
9/19/13 7:55pm

kevmcrae
Former Member
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Kalispell, MT - USA

Vette(s):
1969 427 sport coupe, Monza Red, matching numbers, all original.

Joined: 2/28/2013
Posts: 10

look like 7047387

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Re: Throttle link question (5/13)
9/19/13 10:58pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20133

That appears to be a Service part number....as in a replacement, or over the counter replacement. Definitely does not appear to be original to the car. Probably a '75 - '77 era carb.

If the carb works ok, you can certainly grind the stud off, then drill out the rest for the hole you need for a bolt on stud.

As far as the cable....what part of the cable is too long? The outer sheath, or the inner cable? Don't go bending your accelerator pedal just yet....

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Joel Adams
C3VR Lifetime Member #56
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Re: Throttle link question (6/13)
9/20/13 11:38am

kevmcrae
Former Member
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Kalispell, MT - USA

Vette(s):
1969 427 sport coupe, Monza Red, matching numbers, all original.

Joined: 2/28/2013
Posts: 10

inner cable is a little longer. Was thinking I could stack a few washers on the pedal lever?

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Re: Throttle link question (7/13)
9/20/13 12:53pm

Adams' Apple

Depending on how much too long it is, I think I would try to modify(er..bend) the cable bracket on the carb first...lot easier to get to than the cable on the pedal. Or..get a shorter(correct) cable, maybe.
One trick, if you DO decide to do something on the inside, at the pedal....get some small lead fishing weights...the kind that are slotted down the side. Put one on the cable, between the ball end, and the plastic seat that fits in the pedal, then mash it on there tight. That will take up some of the cable. An old trick, but it works in a pinch! Thumbs Up

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Re: Throttle link question (8/13)
9/24/13 12:51am

kevmcrae
Former Member
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Kalispell, MT - USA

Vette(s):
1969 427 sport coupe, Monza Red, matching numbers, all original.

Joined: 2/28/2013
Posts: 10

Great idea Joel! Thanks!

On more question for you. the throttle lever above the pedal looks like it's been cracked and welded. I bought a new one to replace it. However the old one has a piece of steel welded to it about 3/16 thick, 3/8 wide, and a little over an inch long. It's not reinforcing a weak or broken spot. Wondering if it's some sort of effort to give the gas pedal a heavier feel?

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Re: Throttle link question (9/13)
9/24/13 7:23am

Adams' Apple

Hmmmm....hard to say, without seeing it what it might be for, or why it's there. Can't say that I have ever seen, or heard of something like being done from the factory, or as a service update. Can you get a pic?

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Joel, here's my original lever with the weight on it. (10/13)
10/6/13 10:10am

kevmcrae
Former Member
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Kalispell, MT - USA

Vette(s):
1969 427 sport coupe, Monza Red, matching numbers, all original.

Joined: 2/28/2013
Posts: 10

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Re: Throttle link question (11/13)
10/6/13 11:33am

Adams' Apple

Can't say that I've ever seen something like that....doesn't look "factory" to me. Maybe someone else has one like it....maybe not. I doubt not having it would make any difference in how the pedal fells in use, tho.

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Re: Throttle link question (12/13)
10/10/13 12:59am

kevmcrae
Former Member
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Kalispell, MT - USA

Vette(s):
1969 427 sport coupe, Monza Red, matching numbers, all original.

Joined: 2/28/2013
Posts: 10

Well I got it all back together. I ended installing the ball stud in a second hole that was already on the carb's linkage. The old flat stud was now getting hung up on the cable so got out my cut-off wheel! Using the second hole actually took up the slack from the extra inch of cable I thought I was going to have to deal with. Put a new throttle return spring on it and adjusted the cable. I now can definitely feel the secondaries kick in at mid range RPM's and the big block acts like it has a turbo!

I also ordered a new choke spring and rod. But with the carb not being the original the spring was opposite from what I needed. It pulled down when warm but I needed it to go up. I was about to order another one, but looking at it I thought "I can just bend this frame tab open and flip the spring over." A few minutes later it worked perfectly. So nice to have a good idle when starting cold!

Thanks for all the advice Joel. I'll be looking for a true 69 Quadrajet over the winter.

Kev

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Re: Throttle link question (13/13)
10/10/13 7:20am

Adams' Apple

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