These heads are used on WISSOTA sanctioned tracks.  It is very limited to what work can be done to keep this head legal.  We are able to take full advantage of what the rules allow with our newen valve seat machining center.  We are able to optimize the flow, keep the head legal, and obtain the best valve seal.  We also angle mill the heads then correction machine the intake flange so a standard manifold can be bolted on.  All of this work is done in CNC machines so everything fits and matches up 100%.  Matching this workmanship with the parts quality we use produces a great product!