Dropped timing back 2 more degrees from last time. Increased the jetting in primaries AND secondaries. To .110 and .113, installed a fresh NGK BPR8ES and made a WOT run through the gears, shut it down, pulled the plug.
(Had a fuel pressure gauge taped to the windshield, and it held 6# until the very end and started to drop just a bit.)
My timing light showed 15* initial, and 30* total. Ran strong and felt good. But the plug was completely clean at the base of the porcelain (magnified with lighted otoscope) and the strap burned almost the the plug body. No darkening or color showing anywhere on the porcelain.
I will re-check my balancer against TDC (again) tomorrow, and will get another timing light. This is driving me crazy, trying to understand all this.
I can try upping the jets to .116 in the secondaries (12% fat according to Edelbrock) and my A/F numbers are now in the 12's mostly in normal driving. Some 13.5 mid-range, with the .110 primary jets. (4% lean according to Edelbrock) My idle is in the 12's with the idle screws only a bit under 3/4 out.
Here are photos of the plug from the run today: (NGK BPR8ES)
