Carter AFBs - Numbers for 65 Riviera Gran Sport

[Craig Balzer]

I recently purchased a 1965 Riviera Gran Sport (yup, has a BS tag on the tranny) and am still learning the details of the car, engine and such. The car came with a 401 CID (I know -- not correct) but with 2x 4-bbl Carters mounted on it. The original engine is long gone but the purchase came with a 425 short block (yes -- LX).

 

So the carbs on the 401 have the following numbers stamped into the lower left front corner of the carb body:  FRONT CARB is 3645 SB and REAR CARB is 3925 SA.

Are these correct?

 

Craig

 

PS - My long term plan is to transplant the 425 and put the 401 on the engine stand

Edited September 26, 2019 by Craig Balzer
Add photos (see edit history)

[RivNut]

You can verify those numbers by going to the Rivowners website and finding the link on 'How to ID a Gran Sport.'  Along with some other facts (part numbers) and myth busters (H2 handing package.)

[Craig Balzer]

Rivnut -- it took a little searching and sifting but I found the answer(s). Thanx.

 

Now -- anyone know the casting number on the intake manifold? Is it 1370316B??

 

Craig

Edited September 26, 2019 by Craig Balzer (see edit history)

[psychostang]

1370316 is correct

 

[NC1968Riviera]

Craig,

 

Congrats on the purchase of your '65. I look forward to seeing more of it on the forum.

 

If you are a ROA member the website will be of great value to you, especially the Members Only sections.

 

 

[Rivdrivn]

Hi Craig, 

 

Congratulations! It appears you have all the correct pieces even though the LX block won’t be numbers-matching. The carbs, too, are the correct ones but they also have 3-digit date codes just below the numbers. If you’re really picky you will prefer the last digit to be a 4 or 5 depending on your vehicle build date.

[Craig Balzer]

Thanks all for the warm welcome and quick replies.

 

Another question: I am considering picking up some spares. They include a pair of carbs: one is 3646s ak3 and the other s is 3645s aj3. As I understand the numbers, these are both for a 1963. Despite the 2 year disparity, would these carbs work on a 65 Riviera Gran Sport? (I know they would be "wrong"). As stated previously, the long term plan is install my LX in my car with my carbs, then sell 401. I figure it'd be easier to sell with more bits and parts attached.

 

PS -- I just learned I have a relatively early 65 -- small emblems

[RivNut]

65 Gran Sport linkage is unique for the progressive linkage to work correctly.  The front carb does not have a choke or idle circuits.  The only "spares" are carbs with matching numbers.

Edited September 27, 2019 by RivNut (see edit history)

[Rivdrivn]

Nothing wrong with small emblems, in fact they are quite rare (November through mid-December production only) but I’ve yet to see an exact number, or even a guess. I’d say probably less than 600 were made. Tom? What’s your guess?

[telriv]

Ed,

 

   The correct front carb. DOES have an idle circuit it just can't be adjusted.

 

Tom T.