I have read that to set preload on stud mount rockers you set at zero lash and then go 1/2 , 3/4, or a full turn. I am wondering which is better and why, what are the pros and cons of one over the others? I have a stock bottom end and just put a set of TFS 170 heads and a TFS Stage 1 cam, I went with the 1/2 turn and it runs good but I'm wondering if that was enough or if it really should have another 1/4 to 1/2 turn of preload.