"Clackity" Noise
 

Ok, engine is back together after replacing the head gasket but when I started it there is a "clackity clackity" sound coming from the engine. I don't think it is the valves hitting the pistons as the engine turns over by hand smoothly. Other than the "clackity" sound the engine sounds fine and smooth (good exhaust not, runs smooth).
The sound is almost like noisy tappets of old.
Could it be the lash adjusters needing oil pressure? The cams, and therefore the rockers and lash adjusters, never did get removed when I changed the head gasket and the head was off the car for over a week.
The Chilton manual I have says that, when replacing the lash adjusters there will be tapping when first started. Let the engine warm up, then rev to 3000rpm for a minute, then stop it and let it cool down. The tapping should have stopped at next start.
Considering the noise I'd feel real nervous doing that.

Any ideas?

FYI, a video of the engine running.
http://i22.photobucket.com/albums/b3...h_MVI_3838.jpg

That does not sound good at all. Almost like theres no lubrication.

Here is another video with the valve cover off the bank that I replaced the head gasket on.
Something that's not very clear in the video is that the oil is milky... water in the oil?

http://i22.photobucket.com/albums/b3...f-Clackity.jpg

Any help or suggestions appreciated.

Where is the oil pressure switch in relation to the oil filter? My oil pressure gauge says all is good but could it be blocked?

What year is your car, and what happened to have to replace head gasket?

If the lash adjusters are bad do not rev that engine. My car sounded similiar and I kept on flicking out rocker arms and bending valves on every rev. It was a headache. Get a set of lifters from rockauto and they will probably work out just fine.