Guest Posted June 5, 2001 Share Posted June 5, 2001 whats the bigest and best performing gm q jet and what year and make did it come on?cfm,? Link to comment Share on other sites More sharing options...
Guest Posted June 6, 2001 Share Posted June 6, 2001 Look for one off a 472 caddilac or 500 cid caddy they flow 800 cfm and can be made to flow up to 1200 cfm from a very good carb builder. Link to comment Share on other sites More sharing options...
The Old Guy Posted June 13, 2001 Share Posted June 13, 2001 The 71-76 Buick 455 Q-jet is also 800 CFM Link to comment Share on other sites More sharing options...
Guest Posted November 20, 2002 Share Posted November 20, 2002 The largest original Rochester Q-Jet was called an 850 (somewhere I have a flow test at 839 CFM). Original part numbers were 7041267, 7041268, 7041270, and 7041273. These came on 1971 Pontiac 455 H.O. and Ram Air engines (read expensive). Some service dated 7041263 also are the same size.Jon. Link to comment Share on other sites More sharing options...
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