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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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