Best is on a dyno so some load can be added, with 20 minutes of cam / ring brake in, we cycle the throttle between 2000 and 3000 and some steady spots in between with some load added after about 10 minutes and cycled with and without load. Let them cool down for a few hours then warm them back up and do some full power pulls. Will say, that the first power pull is the hardest to watch, especially when the red line is 9800…. Just pulled a motor off the dyno on Monday for a car going to Laguna tomorrow.