Thank you very much for your help. I am sorry that I was unclear on my Question. The stamped number on the block is 139193D just to the right of the 264 displacement code. The tractor vin is 3415 DS. MY other gas and diesel do not have the D stamped behind the engine vin. If I understand you correctly it is because it is high compression model for above 5000 ft. This could explain why the exhaust is so much louder than the other 400 and super m. Thank you very much for all of your help.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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