v6 essex water gallery location

Hi Mark
I recently took both heads off my 1972 "D" Port Essex (see inset) after draining block via Drain Plug on L bank and found block equally drained. In the unlikely event the Water Gallery design in my 165HP Block is different to the standard 144 HP Engines that made up more than 95% of the V6 Engines, I'd say you've got a blockage.
If block staying in chassis, good reason to remove all 4 core plugs, and hi-pressure wash your block while poking rods thru looking for blockages and general cleaning (first close off ALL oil holes, Cam Valley and bores)
If block coming out, send away for deep-tank "hot-soak-descale" with instructions to "rod-out" any obstructions)
Merry Xmas
Bernie

Thanks for the reply BEEVEE.
 
From memory, I would have just disconnected the bottom radiator hose from the water pump to drain the system. Where on the opposite side of the block is the drain plug located?
 
Happy new year to all.
 
Regards, Mark.

Found it. Looking at the front of the engine the drain plug is on the gearbox side of, and close to, the oil filter.