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Just two more comments/questions. What about the red arrows showing hot water leaving the block in the water flow diagrams? Are they still in the manual JohnnyRude200 or cajuncook?
The other comment is on big powerheads that have been rebuilt with a warranty, the builder would put a pop up temp sensor on the block. It was just glued on the water passage. If a problem with the powerhead was experienced then they would look to see if the sensor had popped up. An overheat had occurred if the sensor had popped up. They came in different temp ranges so you could put one on way past normal temp so there was no,argument as to wheather the engine had been overheated. Not sure where they got them, but couldn’t be too hard to find and had to be cheap. They could come in real handy on repair motors that customers take out and overheat, but say they didn’t.
Dan in TN