Delica Canada | Mitsubishi Van Club

Ever seen anything like this before? I've just purchased a new (bare) head and spent the day grinding valves installing seals, and swapping the bits over. the last thing to install was the injectors when I noticed this funny defect. At the bottom of the bore where the nozzle seats on it's copper crush washer... is a void in the casting! It's like a hole in swiss cheese was uncovered by the machinist whilst boring out the injector seat.

http://imgur.com/na9qqSE

http://imgur.com/FQZBfHn

If you zoom in you can see it better probably. It's about 3/64ths deep my my guess.

What to do? Ship it back to my supplier?

In my opinion it Looks like casting porosity during manufacturing to me.
Typically not an issue except thats a sealing surface.