Ready to quit on Edelbrock 1406 carb swap, 5 installations and always leaks a lot

Thanks to Tony, Russ, Jason and Michael for detailed assist on this. Yes, Jason, I read your carburetor project 4 times before I ordered the Edelbrock 1406. Got through most issues, although there are too many, this is a 20-step project, not a 1-step. I have rebuilt engines myself, including my 1963 split window couple Corvette, with no issues, but I'm not a carb expert and the talk of channels and ports and tubes that all need attention and treatment for this to work make it much more complicated than other simple carb swaps I've done. And, after 5 installations with new gaskets and removing the metal shim, etc., it leaks rather copiously from the choke side, no matter what. 

I'm giving up and returning this bothersome carb. Edelbrock had one suggestion for me, order a Transdapt 2406 adapter. But, nobody else has needed this, and it's not clear to me what difference it would make since I appear to have a good seal between the manifold and the carb, except, OH, it leaks a lot of gas!

Makes me sad because, with this carb on, the car starts instantly and idles high. But you can't run it long with a leak. 

I still do not see what holes I'm supposed to plug and I've been through the area inch by inch. I think I'm better off with a rebuilt Carter and have all of these issues. I would have been happy to hire this job out, but I don't think most mechanics these days would do better than I did with this.

Final question, does anything think the 2406 adapter would stop this leak? Photo of my manifold base attached. 

Views: 194

Attachments:

Reply to This

Replies to This Discussion

Pictures of exhaust heat holes to plug are right there on my carb write- up. I never had a gas leak, and if you go thru the write you should come to the conclusion you only have to remove heat riser butterfly, block head to intake center port and install a spacer insulator. That’s just 3 steps to address heat issues. Any gas leaks however would be of grave concern and would assume defect in the carb. I’ve plunked no less than 4 Edelbrock 1406/1411 ‘s down on 429’s, albeit 10 + year’s ago, and used all sorts of gaskets and spacers without any gas leaks.

The issue with the write-up... or learning experience if you will .... was the fact I first attempted to address the extra heat under the carb by simple blocking the 4 exit points: each end of the choke tube, and the top off intake front runner channels (seen blocked in this picture form my write-up). After blocking all 4 points and removing the heat riser butter fly I found the center channel (runs thru center of the of intake from side to side) was still heating up the intake in the center to about 305 degrees from bypass gas. Putting the block plates at the large cylinder head to intake center exhaust port as seen in 2nd picture below eliminated that problem and basically eliminated the need to block the 2 top of intake ports and the 2 internal choke ends, but it would be perfectly find to block these if never considering restoring the intake to stock operation with the need for the stock internal choke tube.
Bottom line is I need to rewrite that article to make much more clear!  ... it's on my to do list!

Greatly appreciate that. I do not have enough experience to do all that you noted. I have read your excellent article and seen all the photos, and that encouraged me to buy the Edelbrock. But I am not familiar with heat riser butterfly, block head to intake center port or all the variables involved in getting this to run right and eliminate exhaust escape channels, or if I got 2 of them it might be useless if I didn't get them all. I don't see 4 exhaust heat holes in any of the photos, so I will just get a rebuilt Carter and put everything as it was. I don't think a mechanic would get this Edelbrock exactly right in the way that you have done by trial and error, rejetting, temperature measurement and such. Just not equipped for this but I gave it a good shot with 5 attempts. Oh, that is also excluding the PCV tube I do not have anywhere under my hood, or the kickdown that can't be attached to the Edelbrock, so one function that you lose, or the fact that the air cleaner no longer fits and neither Autozone or NAPA had an adapter that would seem to work in my visits to 4 stores. I would caution anyone about trying this swap unless they can really hit every single note, and of course the big leak alone is enough to nix the deal. Thanks for your help and attention, the car is awesome and locally famous. 

Attachments:

RSS

Photos

  • Add Photos
  • View All

Forum

Limo rear A/C box needed

Started by Anthony McCarn in Wanted to Buy. Last reply by Jason Edge 11 hours ago. 4 Replies

the case of my rear evaporator box was severely damaged by the p/o of my car. just in need of the case, but will buy a whole unit if the price is right. thanks!Continue

Tags: box, evaporator, conditioning, air, a/c

looking for a seat belt protector

Started by Christian Doerk in Wanted to Buy. Last reply by Jason Edge 11 hours ago. 5 Replies

I'm looking for a seatbelt protector (marked red) for my Fleetwood Sixty Special (6039) for the CENTER seatbelt. Not the driver or passenger seat belt protector. It's a chromed plastic piece.…Continue

Tags: belt, seat

63 390 engine block needed

Started by Pete Grodem in Wanted to Buy. Last reply by Russ Austin 12 hours ago. 1 Reply

Hellolooking for a good 63 390 block, standard bore preferred.thank youPeteContinue

Current 1963/64 Cadillac Listings on eBay

Started by Jason Edge in For Sale. Last reply by Jason Edge 20 hours ago. 0 Replies

To see all 1963/64 Cadillacs Listed on eBay in the USA…Continue

Tags: ebay

Blog Posts

Looking for 63 Convertible / Coupe rear side trim

Posted by Gene McIlroy on January 24, 2020 at 12:18pm 0 Comments

Want to find a good straight dent free rear side trim for my 1963 Convertible.  I have both sides but they do not match.  Wanting to get them to match.  I am attaching a photo of the two trim sided that I have really wanting the squared off trim if I can get it.  Let's see what you have,…

Continue

Road Trip

Posted by Ray Schick on January 21, 2020 at 9:00pm 7 Comments

Got a little cabin fever this morning,decided to take a road trip to Hickory Corners Michigan, The Gilmore Museum. It’s about 2 1/2 hours from my home . Place is awesome,I was really impressed.

9A648CFF-E965-4CE0-8E91-8E194AC70DED.jpeg…



Continue

1964 429 Aluminum Front Cover For Sale!

Posted by Jeff Kinzler on January 12, 2020 at 3:30pm 1 Comment

  • I wound up with an extra front cover for my '64 and offering it for sale.

Purchased from a knowledgable part supplier with thorough hands-on knowledge of 63-64 Cadillac engines, who checked the part before sending it to me. The oil pump driven gearSee S bore and the pressure relief piston bore are both .002 over and within the .005…

Continue

Looking for the Rochester Choke Tube ...

Posted by Mack on January 10, 2020 at 1:14am 3 Comments

37E244B6-71C7-4857-8D50-1BD8C48077A4.jpeg

Looking to buy the choke tube for my Rochester... anybody have one for Sale???

Videos

  • Add Videos
  • View All

© 2020   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service