yeah, you could be right as the motor is very noisy. I am certain that at least some of the noise is valve related....I can hear the typical tap tap tap. The guy I bought the truck from relaced the cam and it looks as if the chain was replaced as well. I dont know if he replaced the tensioners at that time or not. When I pull the valve cover off next time I will try to check the chain tension. I am starting to wonder if maybe the rocker arms and adjusting screws are worn. If the previous owner threw the old set back in after changing the cam could this be the source of the noise?