After i was done with a very good cleaning of the outside of my Irons and Rotor Housing i found this, It looks like a weld but there isnt anything on the inside of the water jacket that would suggest that is was welded.

The only thing that i could think of is one of thows Mazda Reman Temp things.









What you guys think.

 

Its your car's belly button. duh.

 

Lol