Bruce, we didn't go straight from 69 to 88....
We stepped it up gradually. Apparently the dyno guys were watching the cylinder temps and were trying to even out the temperatures when on the dyno. I think they went a little too far.
I have a Vic Jr. intake.....and my engine builder buddies at a certain
oil manufacturer engine lab told me that they were notorious for having hotter cylinders than others due to the runner configurations.
I think the dyno guys kinda picked out a cylinder or two that were hotter than the others and were trying to richen it up a little bit.
The thing runs like a top....takes gas extremely quick and well....starts easily.....and didn't hesitate when the secondaries opened on the dyno.
The plugs look good....they're a touch on the sooty side....but I've been doing a lot of fuel plumbing lately and have started it often and let it idle.
What leads me to believe that it's a little rich is of course the little carbon on the plugs.....and when it's up to operating temp, you can bump the throttle up to about 3 grand or so....and when you let off, it makes a nice pop out the sidepipes...along with a nice little light to go with it.