Pitted cam caps?

79 KZ750 B4 Twin

Starting to put cams back in when I noticed this (sorry for image size)



This shouldn't be related to cam lope pitting. It looks like air pockets or something from the casting process. I checked the cam shafts and they have no scoring at all. Nothing to worry about?

I think your thoughts are right, poor casting. As for it being an issue, doubt it. I would get some plastic gauge and check the clearance. The pit in the cap bearing surface should just hold a bit of oil, as long as it is a blind hole. In order to fix it, it would require another head, as the caps are machined to the head. Or possibly have it machined for bearing inserts, but that would cost a fair bit. $$$$ Probably not worth that.
If the clearance is good I'd run it for sure.

That's porosity in the casting. Pretty crappy casting....

But it should affect performance if the mating cam journals aren't showing any scoring in the area of the pits.

Thanks!

After a bit of research, it is from the casting. Other people have seen this on their engines as well.

Hydrogen gas porosity is an aluminum casting defect under the form of a porosity or void in an aluminum casting caused by a high level of hydrogen gas (H2) dissolved in the aluminum at liquid phase. Because the solubility of hydrogen in solid aluminum is much smaller than in liquid aluminum, when the aluminum freezes, the dissolved hydrogen gas creates porosity in solid aluminum.