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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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