Guest Posted December 5, 2001 Share Posted December 5, 2001 Best mileage that I ever got with a V-8 and 4bbl was with my 1973 Cutlass (believe it or not) Have had several Quadrajets apart and have noticed that the Oldsmobiles typically have a MUCH leaner primary set-up than a Chevy or a Pontiac even with the same size engine. (Typically the Olds jets/metering rods will be .069"/.050" rather than the Chevrolet/Pontiac combination of .072"/.042" ) How can the Oldsmobiles be calibrated so much leaner on the primary side? Do the secondaries come in sooner to compensate? <P>Anyone else wonder about this or do I have too much time on my hands?<P>Thanks!<P>Mike Link to comment Share on other sites More sharing options...
Guest Posted February 2, 2002 Share Posted February 2, 2002 There are two different cfm ratings for quadrajet carbs hence the mileage and jetting difference. The differences between them can only be measured with a vernier caliper. Otherwise they are identical carbs. Link to comment Share on other sites More sharing options...
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