You can eliminate PVC issues check crank case pressure I know on cars the PVC goes into the back of the intake there is a filter under it that does stop up... I think trucks go into the valve cover right rear.
My 77 F350 used oil bad at 20K miles once disassembled the oil rings were worn out I have see the same issues on other 400's with low mileage. I had so much trouble with the original 400 there for awhile I could not keep a crank in it... I had a good bud that ran a engine rebuild shop build me one All was good till the top tank on the rad separated while on the interstate I ran it hotter than ell. From that point on it would burn a qt in 100 miles no smoke maybe a little when you started it but it ran great...
Those like yours were bad to burn holes in pistons #5 I believe and crack/break skirts on pistons... Running a engine hot is like having a stroke it will never be the same...
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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