Head gasket Question???

[MasterO-6.0]

So I am working on replacing the head gasket on my truck and resealing some of the lower gaskets. I have cleaned the block deck today and I noticed that there is some surface erosion on the rear coolant port. The erosion is irregular and seams to be up about .003.:wtf: Will this cause me problems with the head gasket or not??

The Picture I have included is not my engine but shows what I was talking about.

 

[tommyboy#1]

There would be no reason you should have any issues. The block erosion is very common along the coolant passage. Just make sure it doesnt go into the sealing surface.

 

[MasterO-6.0]

Thanks That had me worried when I saw it. Does any one know why it happens, is caused by the coolant that used or cavitation or some thing else?