65GS.com - Buick Gran Sport Enthusiasts!

Drivetrain => The Dual Quad => Topic started by: 35chevcoupe on February 02, 2015, 03:57:50 PM

Title: 65 dual quad carb numbers for manual trans
Post by: 35chevcoupe on February 02, 2015, 03:57:50 PM

Hey guys I was wondering what the correct carb numbers are for a dual quad set up for 65 manual trans car is ? :dontknow:

Title: Re: 65 dual quad carb numbers for manual trans
Post by: cwmcobra on February 02, 2015, 03:59:46 PM

Front = 3645
Rear = 3924

The 3924 is rare as hens' teeth!

Title: Re: 65 dual quad carb numbers for manual trans
Post by: 35chevcoupe on February 02, 2015, 07:28:00 PM

The set I'm looking at has a 3645 front and a 3646 rear , so what would the 3646 be for ?

Title: Re: 65 dual quad carb numbers for manual trans
Post by: cwmcobra on February 02, 2015, 08:02:58 PM

That's the combo I have.  From my information, its the proper set for a 1964 425 2X4 with automatic trans.  Mine performs VERY well!

Title: Re: 65 dual quad carb numbers for manual trans
Post by: 35chevcoupe on February 02, 2015, 08:13:10 PM

Yeah you are right , I just found it in a old Chiltons manual I have here . My manual doesn't specify auto or manual though .
All it says is 1964 3645 all
                          3646s
                  1965 3923s
                          3924

Title: Re: 65 dual quad carb numbers for manual trans
Post by: cwmcobra on February 02, 2015, 08:33:50 PM

According to the info I gathered from several sources, the 1965 2X4 setup for automatics used a 3925 rear carb. 

Title: Re: 65 dual quad carb numbers for manual trans
Post by: cwmcobra on February 02, 2015, 08:42:40 PM

Here's a chart I put together:

Title: Re: 65 dual quad carb numbers for manual trans
Post by: 35chevcoupe on February 02, 2015, 08:53:16 PM

Sorry about that , it does also show 3925 also . This manual shows several numbers but it doesn't say which ones are for the dual quads . Anyway thanks for your help . I really appreciate all you guys help on this forum .
I'm going thru a 55 gallon drum of AFBs I bought and am trying to decode them .

Title: Re: 65 dual quad carb numbers for manual trans
Post by: cwmcobra on February 02, 2015, 08:57:36 PM

Wow!  Good luck.  I hope you find some gems in there...... :icon_thumright:

Title: Re: 65 dual quad carb numbers for manual trans
Post by: 35chevcoupe on February 02, 2015, 09:03:00 PM

Thanks , so far most of them are pontiac , but did find one for a 63 buick .    :icon_scratch:

Title: Re: 65 dual quad carb numbers for manual trans
Post by: wildcat65 on August 10, 2015, 06:39:14 AM

I have been a lucky guy - This is my # 1 set of 3924 + 3645 carbs.  I bought another from Carmen, and have the original set on the Wildcat 2 x 4 4-sp convertible. 
since the 65 GS was not available with this set my guess is most 65 GS cars with this are running (ex Riviera) automatic carbs.

(http://i51.photobucket.com/albums/f376/Wildcat65/DSC00083-1.jpg)