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I am looking for locations to install a temp gauge sensor - none seem to be found. A thought I had was to use the port for the optional block heater but cannot find where GM put it. They used to be in the core plugs but these motors don't have one.
I might have found something.
On the left rear of the engine just above the oil filter is a removeable plug.
See if yours has that.
If not, try a radiator hose adapter.
Remove it and see what comes out.
If it's on the side of the block a bit above the filter, it still might gointo the water jacket. But I AM just speculating....
ICT Billet makes an adapter that I used to mount the temp sender in the coolant jacket. Unfortunately it had a hex size of 1-1/2" - I did not have a socket that big nor knew anyone close who does.
So I mounted it in the mill, calculating if I removed 0.075" per side my 34mm socket would work. 20 minutes later it was fitted up in the block and snugged down.
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Location of block heater 
