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I just wanted to tell everone about Moyer Marine. I was having an overheating problwm with a Universal 5411 that was fitted with fresh water cooling. I purchased a larger heat exchanger from Moyer Marine that was about 1/2 the cost of other sites and was shipped to my house the next day. I also had two long conversations with Don Moyer about troubleshooting my problem after I installed the new heat exchanger. Even though Moyer Marine deals primarly with Atomic 4 engines, Don was very knowledgeable and helpful with my problem. My 5411 now runs cool as can be. Thanks Don.