I don't get as much driving in as I'd like but I probably do 500-1000 a year. The longest drive I've done is 51 each way to race. 90% is highway on that one. Most of the other driving is around town, up and back to my bros and such. I'm running a small comp cams solid roller (588). I have had any issues. It's been in t he car 3.5 years. I hardly ever touch the adjustors. The Ross pistons make more noise than the cam...lol