All you quadrajet techs...

[lochenjons]

I've had a qjet thats been lying around that came off a 77 chevy truck. I've looked up the numbers on it and found this:

70-pre'76
43-'73
2-Not CA smog legal (great I'm in CA )
4- Buick
4-Auto

So my question is after the number it says "LD" and underneath it says 1433. What do these mean? Whats the difference between a CA smog carb and a 49 state carb? Advantages/ disadvantages? Appearencewise, its slightly different than my 50 state '74 qjet I have now, what are the differences? Again, advantages/disadvantages? It was remanufactured by holley so I dunno if that makes a difference.

I plan on rebuilding this but may not put it on a truck for awhile, any tips for storing it so I wont ahve to rebuild it all over again later?

EDIT: I figured out the 1433 means the 143rd day of the year and 3 is 1973, at least I think thats what it means

 

[dyeager535]

No idea on the LN, but CA always means more strict emissions rules. Could be how many vacuum ports, or how it is calibrated. Really not meaningful if it's been rebuilt, unless you need to pass smog with it and those numbers are something they look at.

 

[lochenjons]

I was mostly wondering if its anything special or at least different from my '74 because like I said it looks different.

 

[dyeager535]

Nothing special more than likely.

There were essentially two major casting changes. "Early" Q-jets have a fairly flat front edge on them, while "later" has a more triangular front that houses the EVAP cannister vacuum fitting coming out at about a 45* angle towards the drivers side front of the truck and down.