Deck height

Readings are as follows, did them all twice cause it looked like the head surface is un-even front to back, do not know if this is typical or if I should be looking at one of my other heads.

Cyl #1 54

Cyl #2 57

Cyl # 3 57/58ish

Cyl # 4 58

Cyl # 5 58/59ish

Cyl # 6 58/59ish

I think I am going to check another head if I can get some valves to seal without a huge ordeal.