Hi Roger, the good part is that the water stayed in the hole and didn't go any where else.....pull that plug and stick a clean rag down to see if any got to the cylinder.
Sorry, I'm behind on this saga so bring me up to speed. You were not running the motor right? You had just done a few crank overs with the plugs out to see if anything shot out...like coolant or in your case gas. Right?
My guess is that after buttoning up after the last plenum pull you tore a gasket...any sign of that on the plenum gasket from that side?
Oh, sorry, use a rag or paper towels to soak up that coolant as much as possible. The I would carefully pull that I/H so I could see the condition of the I/H to head gasket...that may have a tell tale as to where & how the coolant got into that port. Check me on this thought, that is a secondary port, I think? God bless the secondary port T- blades, maybe.
Tom