It's probably a lifter. I've heard of this happening sometimes on hard corners. There have been people that have suggested changing oil, putting additives, and seeing if it doesn't go away with a little time. If none of these are a fix, then it's time to get new lifters. I believe I saw a write-up on rebuilding them on here also.
First make sure it's a tick, not a knock. If it's coming from the top of the engine its likely a lifter. If its from the bottom, it probably not a ticking sound.