You have to be very careful buying some of that really cheaply priced chinese parts. Some of it is absolute garbage, some of it, is actualy pretty decent. Buyer beware. Personaly, anything to do with valve train, I would stay away from. That has to be the biggest cause of engine damage/failures there is. When a rocker arm is described as follows, "Excellent for budget, low lift applications. Needs good oil supply and low spring pressure to survive. ". That is an actual description of a set of roller rocker arms. Yah, that wording sure instills confidence in my mind.
Frank
Advanced Performance
www.get-ap.com