Just installed my cams...

eek. That sounds like valves on pistons. If the lifters were bad, or not filling with oil, you would notice a little play in the valvtrain components. Also, the lifters are a higher pitch click, where the valves nicking the pistons is a more metalic clacking sound, almost a grinding noise. Pop that timing cover and triple check the timing. I would suggest against runnin it anymore. If you do fix the problem, do a compression check to verify that you didn't bend a valve slightly and cause a leak. Good luck man.

One other thing you might consider from my experience... When I put my timing assembly back together one of the timing chain tensioners didn't properly seat against the block, and hence didn't pump up. It caused the timing chain guide to smack the inside of the timing chain cover making a pretty awful clacking sound, even though the engine ran fine.

It happened on the driver's side, so when I took the valve cover off, I was able to see the play in the chain guide when I tried to turn the cam with a wrench. I'm still not sure why the tensioner didn't seat right the first time, but when I looked at it, it was very obviously crooked. Got it seated properly, and it's all good now.

wow. those are 2 responses you dont want to hear