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I was reading some forums and what not, and was wondering if on a 97 f250 7.3 OBS blow by test (oil filler cap upside down) works for this model? If so. I'm concerned :/
 

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Can you post a video of how bad it appears to be? There's going to be pressure in the block that needs to vent, some of it from compression "blow by" but most of it from the movement of the recipricating parts and heat inside the engine. Here a couple videos that demonstarte normal versus bad blow by in these engine:

Normal blow by: Ford 7.3 Powerstroke blowby - YouTube

Bad blow by: powerstroke blowby - YouTube
 

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whistle tits
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If it immediatley blows the cap off, you're in bad shape, if it just kind of rattles around on the valve cover, you're probably fine.
 

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One Stroke @ a Time
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So the question remains is the oil cap test done with the ccv open or blocked?
 

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So the question remains is the oil cap test done with the ccv open or blocked?
Open, it will definitely blow the cap off if you block it.
 
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