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6/25/13 12:25pm - Original Message: '76 Vacumn Line Help'
corvaro
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Bedford, TX - USA

Vette(s):
99 Pewter/Black 6 speed conv 76 Basket Case Blue

Joined: 3/30/2013
Posts: 4

Attaching side views of my new and old carb.

Please see attached. I want to verify all the vacumn lines to/from the carb.

Brief background: Barn find late (metal floorpans) 76. Engine was rebuilt, run a little, then sat for a LONG time.

Mostly original, not too messed with car. Here is what I have done so far:

- Tore out interior (was wet from rain, floorpans are rotted), this is a LA car so no other rust in birdcage, frame, etc, just floorpans from leakage through t-tops.

- Tore down steering wheel to replace ignition cylinder (was frozen). Ignition works great now. Problem is, when I was messing with the cables, I bent the trans shifter cable, so need to replace it and readjust trans linkage. Has original vega steering wheel - very cool!

- Took down gas tank: tested sending unit - good, replaced sock filter, inside of tank has a bladder that was clean, and no rust to speak of, so new gasket and resealed.

- Soft fuel lines all replaced - consists of a 1/4 and 3/8 on one side, and 1/4 on other side which T's to 2 intakes on the tank... not sure why but based on my reading I don't think the tank is right for a 76, its either later or earlier, I suspect it was from a later car. I suspect because the gasket I bought for a 76 was wrong - holes didn't line up along the sides, I had to poke my own, but it was the right dimension. But it works good, no leaks.

- Replaced fuel pump, rod, and gaskets. No leaks works good.

- Replaced carb with rebuilt one that's supposed to be correct for a 76 - got it from a carb guy at a swap meet. It is slightly different from the one that was in there. Again, I strongly suspect the one that was in there was wrong, just any old quadrajet. See attachments - you can tell the old from the new from the "patina".

- Ignition systems all replaced except dist itself.

So I have ports on the new carb that go to nothing. And I have at least 3 vacumn lines laying around the carb that weren't attached before and aren't now.

Car runs good since all this work was done, but I haven't let it run up to temp yet - kindof hard with the rear wheels spinning (remember trans issue, its stuck in gear). It gets good fuel, and no leaks.

I would like advice on what those naked ports are for on the carb, and any guesses on the hoses laying there are for (I know which ones go to the air cleaner of course).

/member_uploads/23701_23800/23755/AZ39B_carb1.JPG

/member_uploads/23701_23800/23755/47CZZ_carb2.JPG

/member_uploads/23701_23800/23755/D3777_carb3.JPG

/member_uploads/23701_23800/23755/546EC_carb4.JPG



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|UPDATED|6/25/2013 9:25:52 AM (AZT)|/UPDATED|
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6/25/13 12:52pm - Reply: 'Re: 76 Vacumn Line Help'
rraider1
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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: 1152
http://willcoxcorvette.com/popup_image.php?pID=27379
This might help Is their an emissions decal under the hood?

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Bob R
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6/25/13 1:07pm - Reply: 'Re: 76 Vacumn Line Help'
rraider1
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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: 1152


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Bob R
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6/25/13 1:11pm - Reply: 'Re: 76 Vacumn Line Help'
rraider1
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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: 1152


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Bob R
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6/25/13 1:30pm - Reply: 'Re: 76 Vacumn Line Help'
Adams' Apple Lifetime Member
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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: 19449
Same basic pic here from the manual. However, neither show the lines to the canister...still looking for that...
This is the best diagram(for the canister hoses) I have here at werk....
Unhappy


|UPDATED|6/25/2013 10:30:37 AM (AZT)|/UPDATED|


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Joel Adams
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6/25/13 5:40pm - Reply: 'Re: 76 Vacumn Line Help'
corvaro
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Bedford, TX - USA

Vette(s):
99 Pewter/Black 6 speed conv 76 Basket Case Blue

Joined: 3/30/2013
Posts: 4
Thanks, these do help. Which manual did you pull them from? I have the 76 supplement, and the 74 overhaul... I also have a chiltons. I haven't subscribed to alldata yet for this car...
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6/25/13 10:21pm - Reply: 'Re: 76 Vacumn Line Help'
nextdoor76 Gold Member
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Kimberling City, MO - USA

Vette(s):
1976 Stingray

Joined: 12/2/2012
Posts: 49
The 76 seems to be a real mix of 75 and 77 parts with a few 6mo. items thrown in just for fun...???  I am mid production numbers...with a build date of Feb. and do not have the Calif. smog stuff. I am a third owner so...95 percent org. but still take the parts with me...and/or have to return..(G) Good luck!

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6/25/13 10:21pm - Reply: 'Re: 76 Vacumn Line Help'
Adams' Apple Lifetime Member
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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: 19449
Don't think AllData will have anything on something this old...at least what I have at the shop doesn't. I do have Mitchell Vintage, which is where I pulled the diagrams I posted.
The '74 Service Manual will not have the stuff like this you need for a '76, but it's close. You should have an Emissions label on the driver side of the firewall, just above the brake booster. It has a diagram for the hoses there...if you have the label.
Another source for info like this would be the AIM(Assembly Instruction Manual)....it will have detailed diagrams. 


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Joel Adams
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6/25/13 11:29pm - Reply: 'Re: 76 Vacumn Line Help'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
Guessing you have an L-48, air, auto, california emissions (since you have a smog pump and orange valve covers)?  If so, original carb should be 17056506 (based on Corvette Black Book).  I concur with Joel's diagram on the canister hose plumbing - only one hose from carb to can, and it plugs into base of carb at the center front (at least that's where I have mine plugged in).  The big angled port at the front top is unused on mine.  I am using a non-original Ebrock Q-jet right now, plus I don't have EGR anymore, plus I've never had a smog pump or EFE (that's the beauty of a '76 L-48, non-California) so I have a lot of ports plugged on my carb.  Probably the most important is where you plug in the distributor advance.  I've got mine in a port that's mid-height on the driver's side front which I think is ported vacuum and it runs pretty good there.  Good luck!  

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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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6/26/13 10:53am - Reply: 'Re: 76 Vacumn Line Help'
rraider1
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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: 1152
Alldata does cover corvettes not sure how far back have used it for 70's and 80's car. some good info but limited.

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Bob R
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6/26/13 12:20pm - Reply: 'Re: 76 Vacumn Line Help'
Adams' Apple Lifetime Member
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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: 19449
Might be available, but mine here at the shop(AllData online) only goes back to '82. Guess it depends on what service/program you have. I prefer Mitchell, anyway, but either is a good resource. 
The Factory manuals are best. Thumbs Up

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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6/27/13 11:25am - Reply: 'Re: 76 Vacumn Line Help'
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: 1152
My mistake The one I have used on line is autozone, I thought it was alldata.
 
 
I agree the actual manuals would be better.


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Bob R
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6/27/13 12:57pm - Reply: 'Re: 76 Vacumn Line Help'
Adams' Apple Lifetime Member
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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: 19449
AllData, Autozone....they both start with an "A"....LOL Thumbs Up

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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6/30/13 12:06am - Reply: 'Re: 76 Vacumn Line Help'
dapperdan
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COLUMBUS, NC - USA

Vette(s):
2011 Grand Sport Coupe, 6-speed 1977 Coupe L82, 4-speed

Joined: 8/19/2012
Posts: 42
You should be able to figure out the vacuum lines from the diagram shown.  I have some additional diagrams, if you still need help.  But I see two issues that you should definitely take care of.  There is only one rusty return spring on the throttle.  That's a disaster waiting to happen.  There should be two new springs installed before you drive it anywhere!  There's an inner and outer and you can get them from Ecklers or Zip.  The two springs are for redundancy.  The other issue is the rubber fuel line.  That's a fire hazard that you should correct ASAP.  That line should steel all the way from the pump to the carb.  Let me know if you need further pictures for the vacuum lines.

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