Stubborn Bolt Removal

[BeeJay]

The motor seems to be seized so I thought I wold remove this plug to ensure that the oil gallery was not blocked. It won't budge!!!!.
Do you think PB Blaster would work ok ? Or should I just replace the engine. I've read here in the past that it is usually cheaper to rebuild than replace ?a

 

[tiltrider1]

Plasma heater will do it.

 

[Comodave]

PB Blaster or the like and heat. Tapping while spraying the Blaster and for a while after may help.