Hi there, this is my first post here.

I'm working on a 1964 Sedan Deville that sat for a very long time (nearly 40 years!)

It still had its original gas.  I've had to do some repairs to the engine, including replacing a bent pushrod, but right now it's running pretty well on a Q-jet from an Olds with an adapter plate so I can move it around.  Actually, I put it together today and took it for its first ride on the road since 1976!

But my question is, has anyone here rebuilt a 4GC carburetor?  I've looked all over the internet for days, and cannot find a procedure to adjust the float that matches this particular unit.  Everything I have found pertains to round (puck shaped) floats, which are intuitive to measure-  These floats are irregular rectangular floats.

I have found a little information from a Buick website, but it seems I can't make the adjustments the way they suggest, the floats simply can't move as far as they would need to, I'm going to wreck something. 

I would greatly appreciate the help of anyone who has worked on one of these- I've got it 90% ready to go, and I'd love to get this carburetor back on the car.


Views: 121


Reply to This

Replies to This Discussion

The shop manual gives detailed instructions on how to rebuild the carb. You can find the 1964 Cadillac shop manual easily on ebay. Available in CD, reproduction books, of the original book.

I purchased the book on ebay, but it's not going to be here for about 10 days. 

Hopefully someone might have actually done this job?  I've rebuilt lots of Q jets, but this one is tricky with all of its floats..

I have the shop manual as PDF. Give me your e-mail and I will send it through "wetransfer".

(Only if you like and it is not against laws)

I would really appreciate that!  I sent a private message/friend request- Aaron

In about 2 Minutes you get the whole manual. 



  • Add Photos
  • View All


Door jamb switches

Started by Jay Waters in 1963/64 Cadillac Specific Discussion. Last reply by Charles Fares 7 hours ago. 4 Replies

Anyone have a good set of door jamb courtesy light switches ? 2 or 4.What does the trunk light operate from ?Continue

wanted, '64 tilt turn signal switch WITH cornering contacts.

Started by john kilbourne in Wanted to Buy. Last reply by john kilbourne 17 hours ago. 2 Replies

I have the regulra one.Continue

Current 1963/64 Cadillac Listings on eBay

Started by Jason Edge in For Sale. Last reply by Jason Edge 17 hours ago. 0 Replies

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

Tags: ebay

Blog Posts


Posted by Fritz Seitz on August 11, 2020 at 2:35am 0 Comments

I have been working on a website-----www.fritzsautorepair.com-----

Does anyone have suggestions?


Posted by Anthony Boles on August 8, 2020 at 5:46pm 5 Comments

My 1964 Cadillac electrical system is running around 17 volt which is to high,the alternator, battery and the voltage regulator was replaced but the voltage is still to high, could it be the pig tail that plugs into the voltage regulator. 

63 Caddy Horn

Posted by Robert Alan Shannon on May 27, 2020 at 9:25am 10 Comments

 Just noticed a 1963  Caddy trumpet horn on Ebay. No part # given but some of his other items are 1963 specific, just throwin this out there, I have no connection to this listing .

Wiring connection help.

Posted by Jimmy Davis on May 24, 2020 at 9:15pm 2 Comments

Can someone help me figure where these connections go? I have a 64 60 special if it matters.…



  • Add Videos
  • View All

© 2020   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service