All three of the Paladin T9 tank sets have block value numbers below their intended level. For example, the Paladin T9 legs are completely identical to the Warrior T9 legs except they have about 15% less block value. The same is true of the Paladin T9 helms versus the Warrior T9 helms. Example:

Turalyon's Legguards of Triumph (Paladin)
Epic
Binds when picked up
PlateLegs
2164 Armor (+0)
+180 Stamina
+103 Strength
Red Socket
Blue Socket
Socket Bonus: +9 Stamina
Classes: Paladin
Durability 120 / 120
Requires Level 80
Item Level 245
Equip: Improves hit rating by 53.
Equip: Increases defense rating by 90.
Equip: Increases the block value of your shield by 240.

vs.

Wrynn's Legguards of Triumph (Warrior)
Epic
Binds when picked up
PlateLegs
2164 Armor (+0)
+180 Stamina
+103 Strength
Red Socket
Blue Socket
Socket Bonus: +9 Stamina
Classes: Warrior
Durability 120 / 120
Requires Level 80
Item Level 245
Equip: Improves hit rating by 53.
Equip: Increases defense rating by 90.
Equip: Increases the block value of your shield by 270.