I decided to calibrate the valve lash yesterday, but now I have a problem and I have no idea as to what it may be, here I've posted a video of when I started the engine today when it was cold, then as you can hear after the engine warmed a little, this is where the problem begins, also my manifold gasket is leaking, so don't pay attention to that noise.
http://www.youtube.com/watch?v=Y6lQug7Zt-c