The costs of having the firing order changed on the new camshaft is not much more than the cost of an off the shelf camshaft. They might tack on a few extra bucks to call it a custom grind, but they all start out as round lobe blanks, and at they point can be made to accomodate any needs. A cam that has already be ground for one firing order cannot be reground for another firing order however. No need for billet unless you just wanted to use a roller cam.
