[eaglesan13]

I've always been told that the two-letter code on the side of the quadrajet carb was the plant code. So, I just figured that meant it designated the plant where the carb was built. I was talking to a friend recently and he said that the 1970 ram air carbs used the same part number for both the RA III and RA IV but that the carbs were jetted differently. It got me thinking and I wonder how the assembly line workers knew which carb to put on which engine. Can you tell the difference between an RA III carb and RA IV carb by the plant code, or were they marked somehow to differentiate between the two?

[Chiefpontiac]

The friend you spoke to was wrong. The jetting, plant code and stamped number are the same for 1970 Ram Air carbs with similar transmission types (A/T v.s. M/T). The plant code is the assembly line identifier that matches the build sheet. Think of it like the engine code, i.e. WT, WS, YS, YZ, etc...

[keith k]

Originally Posted by Chiefpontiac

The friend you spoke to was wrong. The jetting, plant code and stamped number are the same for 1970 Ram Air carbs with similar transmission types (A/T v.s. M/T). The plant code is the assembly line identifier that matches the build sheet. Think of it like the engine code, i.e. WT, WS, YS, YZ, etc...

Yep... what he said.

However, I think Pontiac did that as a complexity reduction measure. The custom carb tuners I've talked to would not set up a carb the same for an RA III as for an RA IV.

[unruhjonny]

Originally Posted by keith k

... I think Pontiac did that as a complexity reduction measure. ...

That's what I've understood - the only carbs to have recieved the two letter codes were units installed at the factory or units made for that production year, which would mean the carb would havea production date placing it from approx. september 1969 through to june or july 1970...

[Chiefpontiac]

Originally Posted by unruhjonny

That's what I've understood - the only carbs to have recieved the two letter codes were units installed at the factory or units made for that production year, which would mean a

Please delete portions of your post for reasons previously discussed on these forums.

[roundportponchos]

WR is the code on the Cal. #573s.

Originally Posted by unruhjonny

That's what I've understood - the only carbs to have recieved the two letter codes were units installed at the factory or units made for that production year, which would mean a "WA" (7040270) carb would havea production date placeing it from approx. september 1969 through to june or july 1970...

I only have three of those code infront of me right now (this is at my work desk, and it is purely to help me readily identify any carbs that I was looking for):

VA - 7040263
WC - 7040273
WA - 7040270

[unruhjonny]

Originally Posted by Chiefpontiac

Please delete portions of your post for reasons previously discussed on these forums.

??

Am I missing something here...

??

[Lloyd-TX]

Here's the deal -

Plant code info should be kept off of public forums. It gives the illegitimate restampers info that we don't want them to have.

Correct carburetor plant codes are found ONLY on the carburetors themselves OR on build sheets. Not, obviously, on the invoices - or anywhere else for that matter.

[mr71transam]

Who are the legal restampers?

[unruhjonny]

I never seemed to have r3ead that post... was it in the general area? - because I don't frequent there...
As unfortunate as it might be, those shady charectures can probably find the info elsewhere, I have a list at home for the codes...

I didn't even think of the nefarious persons looking for this information... I've corrected it... unfortunatly I was quoted, and that still shows up...

I personally think that restamping a singular part is the epidimy of stupid... often I've seen 7040263 carbs nicely restored and changed to 7040273 - this irks me... because there is someone else out there looking for the carb that was re-numbered...
And I'm not touching on people who re-number carbs that are dissimilar to what they started out as... stupid, stupid, stupid...