Quote:
Originally Posted by poncho-mike
Along a similar line of questions, can somebody help me understand how the Carter produced quadrajets fit into the grand scheme of carbs.
I have a pair of 7041262s (1971 455 D-port). One is a conventional Rochester built Q-jet with pick code and production date. The other doesn't have a standard format production date. It has a 2 digit code stamped into it, and the body is manufactured by Carter. Were the Carter carbs used in production, were they for service only, or were they built by and supplied to the after-market by non-GM entities?
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Rochester manufacturing couldn’t keep up with demand once all the GM divisions started providing engines with QJets.
Rochester contracted with Carter to manufacture CERTAIN Chevy and Pontiac QJets to help meet production demand.
When Rochester moved from the carb ID “round tags”, they started using a four digit Julian date code. Prior to that they used a letter and numbering system to identify date of manufacture. Carter-manufactured Quadrajets retained the old date code system and never changed.
Carter only manufactured Quadrajets for the Chevy and Pontiac “garden variety“ engines. They did not ever manufacture any quadrajets for the Chevy high performance or Pontiac Ram Air engines. Carter also never manufactured Quadra jet service replacement carbs for AC Delco.
Carter also supplied new and reman carbs to the aftermarket. They were identified by numbers like 4850S, 6574S, etc., These carbs did NOT use the standard Rochester numbering/ID system.
Carter Qjets are sub-standard to Rochester regarding casting quality.