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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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