Hey everyone.
Here's where I'm at. One day I was driving and my car slowly lost power but wasn't knocking or anything, then it wouldn't even start anymore. I tested the compression and came up with 150-150-0-75. I tore the head off yesterday and the pistons/selves are fine no cracks. I spun the cam gear and one of the valves would stick sometimes in the cylinder with 75 psi but I couldn't see anything wrong with the one with 0. I didn't have any water/oil mixed and it never over heated. I took the head to get the valves fixed w/ new seals and everything. But does anyone have any idea what could have cause this or what could be wrong with #3 cyl?
Any help or inputs much appreciated and I have pictures of the pistons/selves if they'll help

 

I think they should be able to tell you what caused it when the head is repaired.