Rochester Quadrajet's

chryslerfat said

I had thought the early carbs were not called a Quadrajet. I was thinking that term was not used until they made the spreadbore.

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Correct Sir,

That is technically correct.

But the 4MV 'Quadrajet Speadbore' evolved from the 4GC, when it was developed
in the latter-half of 1965 with a 'true' Speadbore design.