Since I was showing some mid-high 15's in my last test drive, I decided to swap the .064" IAB's for some .060" IABS and give it another test drive. The first A/F number is with the leaner .064" IAB's and the second A/F number is with the new .060's (all four in each case). This is a good reference as to what one IAB swap will do to the A/F reading. This one change made a .6-1.0 change in the cruise A/F readings with the outside temps only 8 degrees difference between tests:

In D (foot on the brake): 13.2-13.4 // 13.0-13.2
30: 14.2 // 13.6
40: 14.6-14.8 // 14.0
45: 15.4-15.8 // 14.4
50: 15.2-15.6 // 14.6
60: 14.4 // 14.6
3500rpms (70mph): 14.2 // 14.6
4000rpms:(apx 75mph): 14.2 // 14.4

The .060" IAB's richened the 40-50mph cruising A/F numbers away from the mid-high 15's and brought them back down to the 14's where I want them.

Since my local gas station is E10 and the Stoich for E10 is 14.1 (gasoline 14.7), it looks like I have the cruise numbers in good shape. My in D (foot on brake) numbers show the best vacuum results when I am reading 13.2/13.4. So my 30mph reading will probably stay in the 13.6-13.8 range which I can live with. The 60mph+ numbers leaned out a bit but that might be because I lowered my primary float about 1/8 turn. Both of my floats are now about 1/8" above the bottom of the sight glass for reference.

My 50mph to WOT and my 55mph to WOT (cruise to WOT) are still showing a 12.8-13.0 reading until the WOT shift point occurs at 5700rpms. I was also getting a lean hesitation at the WOT downshift which I can easily fix with a pump cam adjustment on the secondary side.

My next test is to get the cruise to WOT readings back down into the low to mid 12's (E10% Stoich=12.2). Once I see what the secondary pump adjustment does to the WOT A/F number, I may reduce my secondary HSAB's down from the current .039" to .036" to see if I can "sneak-up" on the low to mid 12's. I decided to go this route instead of changing the secondary jets because I have leaned out the HSAB's as part of my primary tuning, and now I might be able to reduce the secondary HSAB's back down closer to stock (.031").

Would changing the "Secondary" HSAB's be a better choice or should I just go with the secondary jet swap?

Thanks