I called rpm last week after they ran a vac check on the head and it came back "ok" after we pulled the block out of the car we noticed the rear engine mount was loose... thus causing the knocking noise that I was hearing... despite that at least 3 of my vennom manifold bolts where loose as well.. they basically fell out by themselves... time for lock washers. At any rate I called rpmrons.com and they told me that they had just found a bent valve on my number one chamber.... this explains EVERYTHING we had experienced... why it was reading low compression...

What other symptoms are there of bad valves out of curiosity?