Quote Originally Posted by mudnut View Post
As a guess, the head repair gunk dissolved over time, and filled the gaps.
The Steel Seal gunk most certainly filled and blocked the water passages on the head surface, and yeah the guess makes sense,
assuming some of the sodium silicate still circulating around with the coolant. Over the years it has been through several coolant changes. So, I reckon the blockage was from the previous run of sodium silicate. Another issue with the theory is that only one
combustion chamber was water compromised. The rest appear to be fine, as far as coolant getting into the combustion chambers(see pictures).