Hello, and thank you for considering us for our machining services.   We want to make this experience as headache free as possible.  Custom Engine Machining has many variances depending on the condition of your core.   Please include the information sheet with your contact and casting info.  We will inspect the cylinder head for quality before we machine, and this takes non refundable labor; for example cleaning, crack detection and pressure checking.   Please send in your most Premium Core for your build; and not your most destroyed.  You receive back the casting you send us.  If the cam bore is out of spec, we will require a new core.  Ultimately you want to send in a good cam journals, and we generally can handle the rest within the general quote.