Leak down test results.
 

Well I finally did my leak down test and here are the results:

Cyl 1 = 12%
Cyl 2 = 14%
Cyl 3 = 14%
Cyl 4 = 14%
Cyl 5 = 12%
Cyl 6 = 11%
Cyl 7 = 11%
Cyl 8 = 13%

It seemed to me that the leakage was coming through the valves or somewhere else in the heads, when I put my hand over the oil spout there was a slight warm breeze (I know I should have had the valve covers off but I had a brain fart). I am planning on replacing the heads by spring anyway so I'm not too concerned about that. I was told that anything better than 15% was pretty good so I figure I should go ahead with the head purchase and worry about a rebuild next year or maybe the next, depending on the next leak down test. Anyway I was wondering if anyone had any comments or advice, the numbers seemed ok to me, I was hoping they would all be around 10 or 11% but at least none are below 14%.

Your leakdown number sound just fine. The leakage is also not in the heads. The air you feel coming from the valve cover is just finding it's way past the piston rings (normal) into the oil pan, and up through the oil drain holes in the heads.

If you were leaking past a valve you would hear it through the throttle body if it were an intake valve, or through a tail pipe if it were an exhaust valve.

My leakdown numbers were also 13-15 percent.