Could one drill and tap a hole in the back of the block (where #6 cyl. is) and route it back to the water pump intake. Using a bronze threaded to hose barb fitting should be fairly easy to install. Coolant flow over all the cylinders should increase. And if the hole/fitting is high enough the air would be pumped out as well.
One could use a mini version say 1/4” just to deal w the air collecting at #6.
A bit if research may turn up other solutions as many/most engines are hot at the rear cylinder. How do other people cope when it becomes a problem?
You may find (for example) that most engines extend the water jacket aft a bit to provide extra coolant volume ..... ???
Buying a boat w a Perkins engine is another thought.
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Eric
North Western Washington State USA
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