I've got a B16A2 and have got a pretty bad tick noise. I open up the valve cover and the valve adjustments are pretty far out. What worries me is that I find that one of my valve spring retainers is chipped off on the edge. I just plan to buy some retainers from KMS but which ones do I buy? They offer an aluminum, chromoly steel, and titanium option. My head and motor are all pretty much stock. Would buying one give me any type of little extra edge or does it not really matter? The only thing I really plan on doing to this is your basic bolt ons, maybe a port and polish. Possibly a supercharger down the road. Thanks for any advice.