And I may as well give you all of it in one piece...
7042244
70 - Prefix code. "70" will appear on all late-60's to mid-70's Rochester
Carburetors. 1976 and later will start with "170"
4 - Dates produced
702 - 1960's
703 - 1960's with A.I.R.
704 - 1970-1975
1705 - 1976-1979
1708 - 1980's
2 - 1972
2 - Carburetor Model
0 - Monojet (1 bbl) Federal standards
1 - Two jet (2 bbl) Federal standards
2 - Quadrajet (4 bbl) Federal standards
3 - Monojet (1 bbl) California standards
4 - Two jet (2 bbl) California standards
5 - Quadrajet (4 bbl) California standards
6 - VariJet (2 bbl) Federal standards
4 - Division.
0, 1, and 2 all indicate Chevrolet.
4 - Buick
5 - Olds
6,7 - Pontiac
4 - Even number means A/T
In later years that was followed by a two-letter plant code, a three digit
date code (002 to 365 - I assume they had New Year's Day off) and one final
digit to indicate the year (e.g. 8 means 1978 in such a case).
There it is. Now you will always know where your Q-jet came from.
