I installed the new exhaust clamps today. As is often the case, I had to modify them to fit the pipe that slips over the header collector. The clamps were for 2.5 inch diameter, and while the headers have 2.5 inch outlets, the merge pipe that slips over top of those has an OD of 2.665". The "T bolt" clamps that were supplied originally were not heavy duty enough to clamp the slip fit connection tight enough to eliminate leaks. These new ones are strong enough, but I had to use a die grinder to slot the holes for the bolt and trim a bit off of the aluminum spacer to achieve a larger overall installed diameter when on the pipe: One of them still leaks a tad, but the other seems air tight. I will mess with the one a bit more some other day. With that done, I went about the main task of the day, which was to get some baseline AFR readings. Stock N27 needles, new nozzles, remanufactured carbs, in sync, etc. Mixture screws are turned down 2.2 turns. Here is idle: Let's call it 10.2 - 10.4. Here is steady state cruise. I will note that at a steady cruise on a very slight incline road, the AFR is a bit leaner than steady steady cruise on a perfectly flat, or very slightly declining road. Also, my RPM are only being recorded properly at idle. Any revs, and the signal is getting lost. This run is basically cruising in third gear at something above 3000 RPM Let's call that 16.2 - 16.5. And finally, a near, if not full throttle pull in first, and second, and part of third: This This one is harder to read. Wish the RPM signal was recording accurately. That said, looking at the above and recalling from watching the AFRs while accelerating with near full throttle, I was surprised to see numbers in the 12's and 13's. I am near certain that the two drops in the AFR line above (I put yellow notes at 4 and 9 seconds are shifts from first to second, and second to third. So, "pulling" in second under near or full throttle (look at seconds 6 through 9), I am seeing 12.9 to 13.4? I think I will work on getting the RPM signal attenuated and then I need to make some more full throttle runs. Perhaps I should do a leak down as a check to see if the engine is fully broken in. I've got about 280 miles on it, and until today, hadn't given any full throttle. That's why I was surprised with those AFR readings - I had only been applying moderate throttle and when doing that I am definitely getting lean AFRs. Transitioning from cruise to part throttle acceleration, I am generally seeing 16.9 to 17.1.