Depends on engine serial numbers on production tractors. Open type nozzles started engine serial number 8927 in a 600. Think that would be in September 56. Head 278292R1 started D-350 serial # 11378. Think those started in November of 57 in a 650. Have information that head 260292R5 was changed to R6 D-350 serial 6689 in a SWD9. Can't find when 260292r6 was changed to R7. That's probably the date you need to figure out what was original to the 600. Think the only change needed to have the angled injector inlet on those heads was to change the injector holder. IH did make a change over package to put open type nozzles in non angled holders.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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