valvetrain ticking, could my cam have done it?

Alright, well last winter I got a different motor put in my car, except the stock cam was replaced by an E303. Ever since then theres been a ticking noise coming from somewhere in the valvetrain. Could my cam have been the cause of this? And whats the best way to figure out what exactly is making the noise, as I wanna get it fixed before I spray somemore nitrous If I take the valve covers off is it going to be obvious what needs fixin, or is there some sort of procedure? Thanks for any help.

I do have some exhaust leaks, but this noise does sound different and everyone Ive asked said its a valvetrain noise.