If a standard tap removes material, it's either because it's a different class fit, or the threads have been compromised (stretched).
For a cylinder head, I suggest you use a 3B class fit.
If you want to clean the threads out with the bolt and ground threads, use a cap screw, they are a 3B class fit.
In a blind hole, a spiral flute tap works best, as it pulls the material to the top. A standard straight flute tap, or the bolt idea will push dirt/crap in.