3.0 Low compression cylinder 6

[mentalbreakdown00]

Hey guys need a confirmation on what I think is going on. I have a 2008 Ranger 3.0 with a cyl 6 missfire. I have only about 40 lbs of compression in #5 150 in all others. Did a cylinder leakdown test and has no leakdown. I am thinking something is wrong with the cam, but on a roller cam???

 

[mentalbreakdown00]

Got approval to tear down, no signs of a spit push tube or bent one

 

[mentalbreakdown00]

Found it, sunken exhaust valve seat ,causing valve to not open (far enough).