Its just an imperfection. A square Divot in the chamber measures 2mm wide by 2mm deep. The divot doesnt go into the water passage.
Im going to run them, I'll get em cleaned up and drive the car like I stole it some more. If they hold up on the 340 with where it is now Im sure they will hold up on a new motor. Heck if something breaks before new motor is done Ill have an excuse to get more shiny car parts.
Now to find a machine shop in Springfield Missouri to do the clean up. Oh also time to buy the other things to make it all work
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