CRG Discussion Forum
Camaro Research Group Discussion => Originality => Topic started by: BULLITT65 on March 27, 2012, 10:52:43 PM
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I don't know if this was a 302 only issue so it could apply to the 350 as well. I am trying to figure out if vacuum line from the distributor which had a metal line and metal clip that bolts to the intake, was used throughout the year, or if there was a mid year change to all rubber from distributor to carb. I would appreciate if guys that have the original metal lines and the clip could respond with build dates, or motor dates. I also would appreciate if any guys with original motors with an all rubber line, and no clip on the intake could post the build date of their cars. I don't have a good picture of this, other than what John Z did rerouting his. So if you have a original picture please post it.
thank you for the help.
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On the L48 with Q-jet it was a combination of metal tube bent to go around the carb base and white striped hose on either end connecting to carb port and vacuum advance port. I think it was called "pipe spark" 3870334 in the AIM. http://www.classicindustries.com/camaro/parts/k0054a.html
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Here's the original arrangement on a Z/28 with the steel tube and rubber hose; the L48 was set up exactly the same as the L35 (AIM section L35, sheet A6, View "B"), with the steel line, clip, and rubber hose.
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Ok, great I appreciate the info on both motors, and the picture. Now is anyone aware if this process was used throughout the 69 production year? or was there a change mid year to a full rubber hose? Thanks for the help
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John, what' the other vac hose going over the valve cover go to, AIR?
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Not trying to Highjack this thread but Would someone post a picture of where the "69 4 speed L48 Vacuum Advance Line hooks up to the carburetor? I've saw it in pictures in 2 different places and the AIM looks too fuzzy on that page.
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John, what' the other vac hose going over the valve cover go to, AIR?
Yup - that's the manifold vacuum signal hose to the A.I.R. diverter valve diaphragm.
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Not trying to Highjack this thread but Would someone post a picture of where the "69 4 speed L48 Vacuum Advance Line hooks up to the carburetor? I've saw it in pictures in 2 different places and the AIM looks too fuzzy on that page.
I just pulled my carb off for cleaning and rebuild, and some intake detailing but here is a pic from the web of an L48 and 7029203 DY carb 4 speed Muncie.
The set-up is a reversed "J" hooking around the Q-Jet base at the front pass side then connecting at the drivers side front ported vacuum source (no vacuum at idle).
Just a note in research I have found that some Corvette and Chevelle guys use the pass side vacuum port (in the photo capped with a blue plug) which is for automatic transmission vehicles to drive the heat stove flap in the air cleaner snorkel, to drive the dizzy vacuum advance. But this requires different weights in the dizzy and setting the tuning to match. So if yours is already hooked up there you can go back to factory setup but you will have to set your timing to base line first.
The factory front drivers side port only gets vacuum as the primaries and secondaries are used not the idle.
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Not trying to Highjack this thread .... I've saw it in pictures in 2 different places and the AIM looks too fuzzy on that page.
Its a non illustrated item on RPO L48 but the notes say same as L35 where it is illustrated on page 280, view B
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Its a non illustrated item on RPO L48 but the notes say same as L35 where it is illustrated on page 280, view B
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Thanks for the picture and information. With what you had posted previously and what JohnZ posted about the L35 I finally got it figured out. The note in my AIM is illegible. This picture is an auto. Where can I find full manifold vacuum on a manual intake for my vacuum advance? The only port on my carb is the choke pull off or the brake booster.
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Thanks for the picture and information. With what you had posted previously and what JohnZ posted about the L35 I finally got it figured out. The note in my AIM is illegible. This picture is an auto. Where can I find full manifold vacuum on a manual intake for my vacuum advance? The only port on my carb is the choke pull off or the brake booster.
The vacuum fitting on top of the intake, behind the carburetor, is a manifold vacuum source.
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Thanks for the picture and information. With what you had posted previously and what JohnZ posted about the L35 I finally got it figured out. The note in my AIM is illegible. This picture is an auto. Where can I find full manifold vacuum on a manual intake for my vacuum advance? The only port on my carb is the choke pull off or the brake booster.
The vacuum fitting on top of the intake, behind the carburetor, is a manifold vacuum source.
I'll have to change the fitting that the brake booster uses so it has another outlet. Correct?
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I'll have to change the fitting that the brake booster uses so it has another outlet. Correct?
Yup - just get another fitting with one additional small hose nipple.
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Thanks for the picture and information. ... This picture is an auto. ...
No the picture I posted for the L48 is a Manual vehicle. As stated brake and RS headlights take vacuum from the intake manifold nipple behind the carb base. Use a T if you have both, single L id only Power Brakes. Vacuum advance is the port pictured on the front drivers side.
The large port at the base of the carb base is for your PCV valve hose.
I don't have an picture of an automatic vehicle, but it would have a kick-down mounted to the throttle linkage and would be using the pass side vacuum port with the blue cap to drive the heat stove in the snorkel.
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Thanks for the picture and information. ... This picture is an auto. ...
No the picture I posted for the L48 is a Manual vehicle.
I don't have an picture of an automatic vehicle, but it would have a kick-down mounted to the throttle linkage and would be using the pass side vacuum port with the blue cap to drive the heat stove in the snorkel.
I see the accelerator rod. What's that black linkage that's hooked to the throttle? It looks like a kick down cable to me. That's why I thought it was an auto.
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I assume both vacuum lines are available reproduction?
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I see the accelerator rod. What's that black linkage that's hooked to the throttle? It looks like a kick down cable to me. That's why I thought it was an auto.
Good question, and who knows. I have only seen the mechanical kick downs mounted to the front. The thread where the pic came from was on aftermarket springs so I just assumed it was one since the factory spring is not there. The owner said it was an L48 with M21 but maybe he borrowed the pic from someone else.
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It is a kickdown cable in that borrowed photo, and you thought correctly Dan.
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I wonder what the owner is using then to drive the heat-stove on the air cleaner snorkel? The port for that is clearly capped off with the blue plug. I can't find the link again but wonder if he did a transmission conversion and left the kick-down in place. In any event to answer your question T the port to use for the vacuum advance is still the one in front on the drivers side above and to the right of the larger PCV port.
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OK, now back to my original question please: Does anyone have any later production 69 Z or other wise that came originally with a rubber hose only, or did not come with the vacuum line clip? If you have a mid year 69 that came with the metal line please state the build date of your car thank you!
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OK, now back to my original question please: Does anyone have any later production 69 Z or other wise that came originally with a rubber hose only, or did not come with the vacuum line clip? If you have a mid year 69 that came with the metal line please state the build date of your car thank you!
All '69 Z's had the metal pipe from the carb and the metal clip for it under an intake manifold bolt.
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John, Do you have the extra port on your vacuum fitting for your "driving set up" on your car?
Mike
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Well, I'm not John Z...but just four threads down from this one is a thread that has a photo of his driving setup. I'll include the link for it.....http://www.camaros.org/forum/index.php?topic=9906.0 (http://www.camaros.org/forum/index.php?topic=9906.0)
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For my "driving setup", I remove the short hose from the end of the steel line to the distributor and close off the end of the line with a rubber cap, and add a longer rubber hose from the vacuum advance can to the existing white plastic tee in the choke pull-off hose. That tee normally has the rubber vacuum signal hose to the diverter valve connected to it, and I just disconnect the signal hose from the tee and let the hose hang (doesn't matter, as I have a BB in that hose anyway and the A.I.R. pump is gutted).
For "correct appearance", I just remove the long rubber hose, remove the rubber cap from the end of the steel line, re-install the original short hose from the end of the steel line to the vacuum advance can, and re-connect the diverter valve signal hose to the tee in the choke pull-off hose.
The steel clip for the steel line is there, but it's hidden behind the brass fuel line Y-block in the photos.
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is there any paint on this clip on a z? One I bought has orange on it but might be off a painted manifold
Thanks
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I think they are originally black.
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I think they are originally black.
You may be correct and know the repops are black but thought my originals were phosphate but maybe they were a black painted phosphate clip and the paint came off??????
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I looked closer at an original one that I bought, and it looks like it is phosphate with a "C" stamped in it. anyone else have an original?
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My original one looks like it has a natural, although gloss black, tempered steel finish, not painted. It has an "O" stamped on the inside above the mounting hole.
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My original one looks like it has a natural, although gloss black, tempered steel finish, not painted. It has an "O" stamped on the inside above the mounting hole.
Kinda reminds me of the old metal banding material look.
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Kinda reminds me of the old metal banding material look.
Yep. Only thicker metal.
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john z,s pictures cleared a lot up for me also thanks. I have a 09a and would like to know what spark plug wire retainers it came with from the factory and if it had lifting lugs on it. thanks Iceman