95 Yukon TBI LH cycl. head water leak

[krzdave]

I have a 95 2 Dr Yukon 4x4 5.7 TBI. I am pretty sure my LH (driver's side) head is leaking coolant from a bolt the is holding the plug wire bracket. It is located on the rear of the head. Firewall end of head.
Does anyone know if that hole goes into the water jacket?
Anyone ever have any experience with this happening?

Can I just remove the bolt clean it up and seal the threads, maybe put some RTV around the head of the boot?
Or does this mean I have a blown head gasket?

 

[b454rat]

I believe all the holes are blind holes. Most likely intake is leaking or possibly blown head gasket.

 

[PlayingWithTBI]

Just about all of the head bolt holes go through to the water jacket, some of the intake manifold bolts do too. You can use this stuff on the threads, much cheaper than Permatex thread sealant!

https://www.lowes.com/pd/Oatey-Great-White-Sealant/4750813