Note: If you have a new CAS mount, test fit it to determine if any eccentricity is in your mount or the head. If your original error is repeated with the new mount, the error is with the head, if it is concentric with the new mount, you are done, use the new mount! If not, continue.
Remove the aluminum CAS mount and the 2 alignment dowels from the cylinder head. Note: Timing belt cover backing plate is not shown in any steps for clarity.
3. Drill out the dowel holes in the head with a ¼” drill if the eccentricity is less than .012” TIR, else use a drill that is large enough that the aluminum mount can be aligned.
4. The dowel pins should be a slip fit into the CAS mount holes (they should go in and out of the holes by hand). Clean the dowel pins and remove any burrs from the holes until the dowels can be slipped in and out of the holes by hand. This will allow the dowels to stay with the head during any future disassembly.