Coolant Leak in Cylinder

[Reegs941]

All - I have a 2014 sierra with a 5.3L.  I had a lifter fail in cylinder #7.  We are in the process of doing a DOD delete and new cam, but upon opening cylinder #7 we are finding some damage.  We believe this is a result of a coolant leak.  Some of these pics are pre and some are post trying to clean it up.  Going to try be removing pistons to clean it up the best we can and replace the piston rings.  
 

just wanted to get folks thoughts on best next steps and if you feel we will encounter any issues.

[Reegs941]

[Reegs941]

[Snowcamo]

Compression test or just do the right thing and rebuild.  Even though the cross hatches are present that cylinder looks pitted.

[rav3]

How many miles on it?

[Reegs941]

8 hours ago, rav3 said:

How many miles on it?

139K

[Reegs941]

8 hours ago, Snowcamo said:

Compression test or just do the right thing and rebuild.  Even though the cross hatches are present that cylinder looks pitted.

Looking into getting it machined now.  Anyone have experience with this?

[CamGTP]

I've seen worse get cleaned up with a ball hone on a drill.

[Reegs941]

13 hours ago, CamGTP said:

I've seen worse get cleaned up with a ball hone on a drill.

That’s what we did already which is the 2nd and 3rd post pics but the pitting is my concern.  Trying to do it right so it will continue to perform for a good 5-6 (100k+ miles) more years.

Looking into getting it machined and then new piston rings to fit.  Does anyone have experience with this?

Edited February 1, 2024 by Reegs941

[rlcole321]

I don't see any clear evidence of a head gasket failure, you may have Block or head crack issue (where did the coolant come from??), I would verify before doing all of that work and putting it all back together and the same thing happen, Or maybe start off with a used motor and go from there.