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Wow, you guys are helpful. As I reported in my last thread my engine appeared to be overheating. I received incredibly good feedback and tried to adhere to all of it. I took off the water pump and used the resulting port to flush out the engine. Quite a bit of rust and gunk came out. I flushed the radiator in reverse and then put a garden hose with a narrowed tip into the water pump port and flushed it some more. Two weeks ago I got a 180 degree temperature and overflowed within an hour. Now the temperature gauge shows 160 degrees, increasing to 170 degrees when sitting at idle. I used a Micro Temp laser gauge to measure temperature in the radiator and obtained the following results in degrees F, going from top to bottom in four rows, 186, 172, 184 169, 168, 172 164, 163, 166 159, 166, 167 Could anyone tell me if these temperatures in a honeycomb radiator represent reasonable temperatures. I was running for ten miles at a top speed of 45mph. Ambient temperature was about 65 degrees. The engine coolant was water with water wetter. The engine did not appear to overheat and ran quite smoothly. Thoughts. Thanks again for all of your help. Steve:D