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Fuel efficiency with Olds Quadrajet (Newby question)


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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

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  • 1 month later...

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.

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