How do you do the tape? What kind of tape?You need seals on both the intake and exhaust. Stock heads did not use seals on the exhaust valves, but the guides were higher and the valve stems were made to work with no seals. You have aftermarket valves. Most seals come with a clear plastic sleeve to put over the valve stem so you don't cut the seals. I have used a wrap of tape on the stem if I don't have a sleeve, and oil on the seal.