General Category > Quadrajet Carb Talk and Tips

17058213 carb

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old cars:
Hi guys, Im new hear. My question is about jetting these truck carbs that have SMAB of .050". Can we treat them to the same rules in the recipes of Cliffs book or do we look at them differently because of the SMAB being only .050". Thanks in advance

Frank400:
I do have the book and read it a zillion times, I've built scores of Qjets but I admit I never built a single main air bleed, but I'm quite sure he gives some recipes for them in the book, I just don't have it with me now.  I may be wrong, though.

  I know for a fact that they use  M style primary rods with .036 power tip, but I'm sure you know that already.

old cars:
Actually these truck carbs have early style castings. original jetting was #63 mains 40B rods and CP sec rod

Frank400:
Ok sorry, I thought it was the alter style  of SMAB carbs with external (from airhorn) APT. 

old cars:
First recipe in Cliffs book shows SMAB .045 to .060 use .071 to .073 jet.  With the original jet size on this carb being .063 and 40B rod and .050 SMAB this would seem like quite a jump. Maybe I am missing something here

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