When a cylinder head comes in it gets checked for cracks. Second step is we glass bead the head find out what's wrong with the head let the customer know what's wrong with the head. Then we get the OK from the client. We do everything on the state of the art serdi machine . This is the same machine that NASCAR uses! Also this machine will let us put on all three angles at the same time We can also install valve guide we can also install valve seats if necessary. We can also service all heads on a Peterson surfacer with precision and quality.