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KULTULZ
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"Crankcase vents out the fresh air vent in the front of the valley cover".
Don't misunderstand or let me upset you, but the oil filler cap (on this period design) is your fresh outside air inlet for the system. It also has (should have) a clean filtering element within it. Fresh air is drawn in and enters the crankcase.and exits via the road draft tube or a PCV SYSTEM.
On a turbo install, PCV works as on a NA engine until boost comes in at which point the PCV valve is forced by the boost pressure to shut the valve to prevent the crankcase from being pressurized by the boost. At that point, there is no crankcase ventilation unless a secondary system under boost is employed.
That excess crankcase pressure can cause seals and gaskets to leak/blow.
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58F600
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KULTULZ (11/2/2026)
How is the crankcase ventilated under boost (piston ring blow-by)? Brand name on the oil separator? Crankcase vents out the fresh air vent in the front of the valley cover. Catch can isn't anything special. They are pretty universal. The hose that comes with them is pretty cheap, plan to use hose from the parts house. https://a.co/d/0bPxDdZt
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KULTULZ
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How is the crankcase ventilated under boost (piston ring blow-by)? Brand name on the oil separator?
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58F600
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KULTULZ
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"It has the PCV conversion back in the rear. That runs to a catch can and has a checked valve in it between the catch can and the base of the throttle body. No boost goes into the crankcase." You have an OIL SEPARATOR plumbed in? How much does it collect between services? Do you have a photo of the install?
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paul2748
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I use plain cork gaskets that I have laying around and I don't have any leaks.
54 Victoria 312; 48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ
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58F600
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Group: Forum Members
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It has the PCV conversion back in the rear. That runs to a catch can and has a checked valve in it between the catch can and the base of the throttle body. No boost goes into the crankcase.
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58F600
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Yeah I think my valve cover might have a little warp in it. I'll check it out when I pull it off again. That's what I was looking for. Something a little stiffer than the 100% silicone one. Maybe I'll get both and give them both a try
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KULTULZ
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| 58F600 | Posted Yesterday | 
| It's 2026 who makes the best valve cover gaskets available.
I seen real gaskets makes them, but if they're like the pan gasket I'm afraid they'll squidge out. Anyone try them. I did the fel pros last time and they only lasted a couple years. This truck gets driven hard and often.
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FORD DEARBORN
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The only gasket, in my particular case, that would seal 100% and lasted well over 10 years are the 1/4" neoprene gaskets sold by John Mummert. I have a slightly warped valve cover so my problem is unique. As mentioned above Dan Jessup had good success with the silicone gaskets and has an excellent video.
64F100 57FAIRLANE500
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