Low compression

[ID89GT]

I have low compression in my number 8 cylinder, what all could be possible issues? It cranks over just fine with no noises or anything and all the valve train looks to be good from what I can see without pulling anything apart besides the valve cover

 

[wv109323]

Burnt valve
Blown Head Gasket
Valve stuck open(unseated)
Pushrod Too long
Bent Rocker arm
Cracked Piston
Rings Broke