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).

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|UPDATED|6/25/2013 9:25:52 AM (AZT)|/UPDATED|

http://willcoxcorvette.com/popup_image.php?pID=27379This might help Is their an emissions decal under the hood?

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....

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

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...

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!

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.

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!  

Alldata does cover corvettes not sure how far back have used it for 70's and 80's car. some good info but limited.