Hello all! (i cross posted from the civics forum because i wasnt sure which was more active).

I have a 2003 honda civic ex 5mt that I've almost returned to baseline. Last week, making my last 90 mile commute, temperature spiked the temp gauge all the way up. So i pulled over, white vapor coming from under the hood. I let it cool down a bit, and i attempt to check the radiator. The rubber on the underside of the cap disintegrated in my hand. Eventually i get it filled up, once it cooled off enough it wasn't immediately boiling out.

So i start it and sure enough it shoots coolant in the air while turning over. So i get it towed. Fails the carbon test, it's a bad head gasket.

So i took it apart this week. The head is straight, no warping. And no coolant/oil or oil /coolant mixtures. The gasket is blue, and missing the blue in some areas. And, cylinder 3 (2nd from passenger side) has vertical scratches. This is my first time diving this deep.

What does the head gasket looking like this mean? And what does the cylinder scratches mean? Currently trying to decide if its worth rebuilding. The local machine shops are busy for 6 months and i know nothing about modding pistons / boring etc. For context, the timing belt / water pump were done last year. And compression two weeks ago was 116-120 across all 4 cylinders. Thank you in advance for your thoughts and help!