If you are a maintenance nut and check these regularly, I'll tell you what I run mine at to quiet the valvetrain down a bit - I won't post it as if you don't check them often, you can burn a valve pretty easily.
I've heard (well literally and read) and the valve train on the Wolvies can be fairly noisy. I noticed that once mine is up to op temp, it does make a bit of noise.
