There's at least 3 engines used in 6420's, I looked at the parts catalog and all 3 I saw had a pretty good sized breather hose attached to the valve cover and hanging down below the engine.
Find that hose and see if it has somehow gotten pinched closed, blocking the flow from the crankcase.
If it ISN'T restricted you have MASSIVE blowby that is greater than what the vent tube can handle.
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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