I need some more help.
My last issue was having a cruising A/F ratio of 14.0 at 3500-4000rpms. I changed my primary jetting from 62's down to 60's and now I am seeing 14.4 at both cruising rpms. I can be happy with this for now. After discussing this issue with QF, the tech thought that it was strange having 62 jets in the primary side and still getting a rich number of 14.0. But after a long discussion about my A/F numbers (cruise, WOT, bleeds, etc.), it was decided to test the 60 main jets. That appears to be working.
Now I have created another issue. At any cruising speed (30mph-60mph) and I press the accel pedal for light to medium accel, my A/F goes lean (16.o+) and the car is surging under these accel conditions. What I have noticed is that once the vacuum drops below my pv rating (9.5 high flow), that is when the A/F goes into the 16.0+ range. Since I have leaned down the main circuit to the 60 jet, I am assuming that the pv does not have the flow to keep the engine happy now. This to me sounds like a PVCR issue (too lean) but I do not know anything about them except that they supply the fuel to the pv when the pv is open. I do not know what the stock PVCR's are in the SS-750-AN carb, but I am assuming that I need to open them up.
The following is my setup and A/F number as of this morning. As you can see, I am very close all over the range and I do not want to make a change that will affect the rest. I do know that I have a little bit to spare at WOT and my in D A/F was rich this morning at 13.0.
60/78 jets (stock spread was 14 sizes), .064 IAB;s, .039 HSAB's, 9.5HFPV, 40% linkage delay on secondary side, front float at 1/2 mark and secondary float at bottom of glass. (cool weather at 63 degrees):

35mph=14.6
40mph=14.4
45mph=14.8
50mph=15.0
55mph=15.2
60mph=14.6 (3100rpms)
3500rpms=14.4 (was 14.0 w/62 jets)
4000rpms=14.4 (was 14.0 w/62 jets)
0-WOT thru shift points: 13.0/13.0
50-WOT was 13.8 at shift point (lean)
50-WOT showed "0" on vacuum gauge with the 750 DP (actual 735cfms per QF)

If my PVCR's got richer, this might help the WOT number too with no other changes.
Is the PVCR the next change?

I am thinking of dropping the main jetting again to 58's and then sizing the PVCR's from that. This might lean out my 3500-4000rpm A/F into the mid to upper 14's. Then resizing my secondary jetting to suit. This might reduce the front/back jetting spread to get me a little closer to the stock 14 jet spread.
QF did say that the annular booster pulls more fuel than a downleg, but my jetting surprised him.

Thanks again.

Last edited by YO7_A66; 09/11/11 11:18 AM.

1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)