Agree more of a water dispersant for when you wash you block to keep the moisture away!
Last thing you want hiding in some crevice of you block to be chewed up by your pump and possibly plug of a port down the road.
If you're going to store it for a long time, like my 340 block i took out for a stroked 360 block. you put lots of Grease on every shiny place in the block, then turn it upside down and fill with cardboard........Then seal with a large garbage bag. Then a blanket over that too help from the bag getting punched.
In a climate control building or house it will take longer but it will still rust just the same.
