Do you mean by "top dead center" the less rounded or more pointed part of the camshaft is facing straight up. Like when I'm doing a valve adjustment. I'd read about TDC but for got to ask what that meant exactly. If I'm correct I need to do one at a time and turn the engine in the same fashion as a valve adjustment leaving the cam portion for the next cylinder pointing up prior to doing the next seal. Start from the front and move to the back? Please let me know if I understand correctly. OH yes thanks for the motor mount help yesterday. It all went well after that. RAY M