magnafluxing the block

[mk3ukr]

I will be magnafluxing my block, in which places it is prone to crack?
I know I have to inspect all holes on deck, oil filter nipple thread... Where else, like mains, etc

 

[IJ.]

Just about anywhere there's a machined sharp edge.

 

[jdub]

I have noticed it's pretty common between a head bolt hole and the water jacket.

 

[mk3ukr]

Understood, thanks