Yeah cuz I sold a head to some guy who said he was a mechanic. I let him look at the head twice and he even brought a friend with him to look at it. He buys it, three days later he calls me and hes like ohh you ripped me off, you didnt tell me it was tapped blah blah blah but i mean what kind of mechanic doesnt know that a head is tapped just by looking at it. so hes trying to say he cant use the head now. thats why im asking if you can still use it even if its tapped. its done with an screw allen bolt.