got a buddy who bought a project car with a 440 engine and he has found an odd problem. He can't get the spark plugs to go in because there is some kind of weird growth cast into the cyl heads just below the spark plug opening:



now, he lives a few hours away so I haven't seen these in person yet, this is just the picture he sent me. I've had my hands on pretty much every factory Mopar cyl head and many of the aftermarket ones and this is something I've never seen. He popped a valve cover and found the casting number 7579007, which I've never heard of.

Anyone know what is going on here?