Rattle sound from passenger side valvetrain..

Hey all!

I am starting to look into a strange sound I am hearing out of the top of the passenger side head... I noticed it nearing the end of the season last year, and I have left it be while stored over the winter..

Now is the time I need to look into/repair this.

I pulled the valve cover and everything seems normal, do I need to sping the motor and chekc the rockers while each cylinder is on top dead center?

Can I pull the lifters with just the valve cover off? and inspect them?

Thanks for any tips!, I could get a video of the sound, if that is needed

thanks,

Shane!