Here is a pic of what you found in your valve cover Greg:


Here is your description:
Hard chunks but not magnetic, brittle, looks like lava bricks. Compression is low 150-150-120-100

I find it hideous that your blaming this on me. After looking at the pic really close, a few of us guys here think its a hand full of asphalt one of your hater friends dropped in the valve cover! Pretty consistent with your description as well.

Might want to look into who you were hanging out with that day