I use a heat cycle method on all my engines. I'll run 2 tanks on the box. The first tank I try to maintain between 180-200*. The second tank I will go up to around 220* max. Everything after that is on the ground running. I will fluctuate the temps between 180-220 throughout the next 8 or 10 tanks all depending on how much mechanical pinch there is. I usually try to put 1 1/2 to 2 "easy" gallons on an engine before setting a hard race tune.