When i hit the track i usually get there at least an hour early so the truck can completely cool. Then i will do 2 back to back passes then take a break & let it cool for another hour. Then run a few more. I've got the best results doing it this way! I agree, heatsoak can kill your times! That's another reason i never put my fender liners back in after my header install. It lets all the hot air escape out through the front wheel's.