For the most part, even numbers were used on automatic transmissions, and odd numbers on manual transmissions, but there were numerous exceptions. The last number indicates the exact application. The 6th number indicates the division application.The 5th number is either a “ 1” or “ 2,” indicating Federal (49 state) emissions, or a “ 4” or “ 5” denoting California emissions.Some Carter-produced models lack the “ 70.” Carburetors produced until 1969 begin with a “ 702″ followed by four additional numbers.Model Federal / California Emissions Specsġ,3,5,7,9 – Odd numbers – manual transmissionĠ,2,4,6,8 – Even numbers – automatic transmission Identify a Quadrajet – Quadrajet Number Search 1966-1975 Rochester ID number breakdown EXAMPLE – 7041240 – 1971 Buick Federal Quadrajetģ – 1960’s with A.I.R (California Only Smog equipment)Īfter 1975 Carb will have an 8 digit code starting with 1 – i.e 1704.
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