Blown Head Gasket?

Excellent
I figured it was a coolant issue. One of the problems with these and most engines that have poor coolant health for a while is that the head gasket water porta get jam packed with rust.
The acid you used probably did the job and was probably the issue.
When I flushed my rocket with thermocure I got about a full cup worth of rust and scale crap out.
 
I’m just hoping it stays fixed!!!!
 
I’m just hoping it stays fixed!!!!
it will. Your issue was a clogged system on a less than ideal mixture of coolant.
Here is what i pulled out of mine!
Antifreeze overflow from reservoir
and that was at 8K miles on the STOCK coolant. word is that if the coolant was not changed every 5 years or so that it basically would rust out the sleeves and head gasket ports.