To spot a blown head gasket on a cylinder you can take your cell phone and take pictures up close between the block & head. You'll normally see a gap or an area with residue (from exhaust gases). I spotted the leak on the #6 cylinder on that 04 I'd bought for it's off road parts almost immediately.

 

A simple compression test should validate. If it is a leaking exhaust manifold, compression will be normal. If head gasket, compression will be off.

 

I did a compression test before when this first happened, and I most likely did it wrong but the numbers were all over the place, but none significantly low. Most of them were incredibly high.
I'll try to get some pictures in the next few days and maybe a video. I'm not very knowledgeable with terminology so that might be more useful than "under the blocky thing next to the bolt thing near the squishy hose thing."

 

That's why I posted a photo of a head gasket blown out at a cylinder (in the photo it was cylinder #6).

 

"under the blocky thing next to the bolt thing near the squishy hose thing."

Cant wait to see how this project turns out.