General Category > Quadrajet Carb Talk and Tips
I need the stock specs for a 17050213.
novadude:
--- Quote from: Cadman-iac on December 11, 2025, 09:17:47 AM ---
Maybe an AFR of 12.5 at WOT because of how heavy this thing is would be better, I honestly don't know.
Rick
--- End quote ---
IMO, anything from 12.0-13.0 would probably be fine at WOT. Mine hovers in the mid-12s, but will momentarily go lean to low-13s after shifts, etc. I haven't data-logged, so this is just trying to watch the gauge on an open road. 12.0 - 12.5 would probably be better as an average in case you have distribution issues that cause lean cylinders and you intend to run it WOT under heavy load. 11.0 sounds very rich to me, but probably won't hurt anything or cost much power.
novadude:
As for E10 vs ethanol free.... this is not scientific, but I run E10 93 all summer long. I ran the tank low and put in ethanol free 90 octane in preparation for winter storage (like I do every year). On the highway, it seems to run 0.2-0.3 AFR richer with ethanol free, but weather conditions may have been different which could also affect results. I don't think E10 vs E0 makes enough difference to worry about when it comes to carb tuning.
Cadman-iac:
--- Quote from: novadude on December 11, 2025, 12:41:15 PM ---IMO, anything from 12.0-13.0 would probably be fine at WOT. Mine hovers in the mid-12s, but will momentarily go lean to low-13s after shifts, etc. I haven't data-logged, so this is just trying to watch the gauge on an open road. 12.0 - 12.5 would probably be better as an average in case you have distribution issues that cause lean cylinders and you intend to run it WOT under heavy load. 11.0 sounds very rich to me, but probably won't hurt anything or cost much power.
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I don't hit WOT for any length of time, just when passing or taking off to catch an opening in traffic. I just want to be sure it's in range for any WOT maneuvers I may have to make, I really don't want to fry this engine while doing it.
I looked at my logbook for this thing and empty it weighs just under 6000lbs, 5700 to be precise.
The last time I took a load of scrap to Tucson the total weight of everything was 15,000 pounds. With the TBI system it actually pulled it really well. Im hoping that it does even better with this Quadrajet, but I'm not even going to try it until I'm sure I've got it dialed in correctly.
Cadman-iac:
--- Quote from: novadude on December 11, 2025, 12:46:03 PM ---As for E10 vs ethanol free.... this is not scientific, but I run E10 93 all summer long. I ran the tank low and put in ethanol free 90 octane in preparation for winter storage (like I do every year). On the highway, it seems to run 0.2-0.3 AFR richer with ethanol free, but weather conditions may have been different which could also affect results. I don't think E10 vs E0 makes enough difference to worry about when it comes to carb tuning.
--- End quote ---
That's good to know. Another thing is the altitude. Im at 4600 here, but Tucson is another 1400 feet lower. What elevation are you at?
77cruiser:
At 4600 ft. wonder if that's why it was so rich when you put that carb on.
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