I find it very interesting.

Although super rare less then 2 weeks ago a set of nos t/a head castings and nib rockers sold for $1600. A very good buy for someone.

Ive had some heads that like in your pics show the small bit of casting chipped out of the head bolt hole, can you speculate on the cause of that?

Are you going to flow them? Just wondering what they would show with the bit of cleanup work you have done.