Well, I have 7 tanks on my tuned 21 now. I did 4 idling 1 at 160, 1 at 170, 1 at 180 and 1 at 190. Pre-heated to 150 before I fired it up for the next tank and the first two that I ran tonight also. I let it cool down to 100 between tanks. Tonight I threw it down and started driving it. I would do a 2 second count to 1/3rd throttle for the first tank, 2 second count to 2/3 throttle on the second tank and a 2 second count to near full throttle on the third tank. I am currently out 2 hours from factory settings on the lsn and it seems to run just fine. Never saw over 205 while I was running it and it is still very tight so I figure the temps will fall down more once it fully breaks in. For now, I am just keeping it smoking good and to hell with the temps. Even with the carb this fat it still has plenty of power so we'll see how it runs this coming weekend at its first race.