08 D8 antifreeze question

[RMK13]

I just recently rebuilt the motor in my 08. I had the cylinder redone and put in wiesco pistons. After 200 miles i just pulled to power valves to check on everything, and there appears to be antifreeze on the mag side power valve. The top of the pistons and spark plugs look great all black no white. Where would this be coming from? Has anyone else seen this?
Also after sitting for two days the antifreeze bottle was almost empty but when i pulled the cap it was under pressure and filled right to the cold line. Is this normal?

 

[thefullmonte]

The antifreeze level in the bottle will vary slightly. I'm guessing it changes some with atmospheric pressure.
As for the exhaust valves, I have seen some slight moisture on mine before. I suspect it was just condensation occurring on the valves.
How do the pistons look?

 

[RMK13]

Is the bottle supposed to be constantly under pressure like that?

The pistons look like they are scarred but i am not completely sure on this. I turned the oil way up when i rebuilt it so i dont know if it is lines from so much oil being in the cylinders or if they are in fact scars.

The droplets on the power valve appeared to be green though like they were from antifreeze.

 

[RMK13]

Update i went out with a Q-tip and tried to wipe off the lines. The lines didnt come off, but feeling in there it doesnt feel like they are actually groves in the cylinders. Could it just be scuff marks from the coating wearing off??

 

[deepdiver]

see if you feel with fingernail. marks in the coating are usually not feelable (is this a word?)