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Retrofitting Thunderbird Valve Covers for Breather Caps

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  • Retrofitting Thunderbird Valve Covers for Breather Caps

    Forgive me if this has been discussed. My rebuilt 390 FE has a new Edelbrock 2105 performer intake manifold. I’m finding out there are issues I need to deal with. The main one I’m on right now is the absence of an oil filler tube. I’m dead set on using the 1964 Valve Covers (hopefully). Is there any other options for me? I assume there also needs to be a crankcase vent. So my conclusion has been to possibly remove the valve covers, drill out a hole and install breather caps, killing two birds. Is this the best way? If so, has anyone done this with the same valve covers? I’m considering the 45 degree bend on the rear corners.
    Thanks in advance.
    5A925535-E1BA-4017-BE5B-A112B725F1DB.jpegB05504CB-A558-4166-AA33-50A4659B39A5.jpeg
    SquareBird in BirdCity

  • #2
    Your engine needs to breathe. There are a few methods you may use.
    Valve covers with caps also include oil baffles under the holes. I prefer a breather cap on both valve covers so fresh air enters one and it comes out the other via a pcv. If you don't have and entrance and exit, your pcv will promote oil burning and blowby. - Dave
    My latest project:
    CLICK HERE to see my custom hydraulic roller 390 FE build.

    "We've got to pause and ask ourselves: How much clean air do we need?"
    --Lee Iacocca

    From: Royal Oak, Michigan

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    • #3
      Hopefully this’ll do the trick...
      8B1837E8-6E45-4326-8A95-61279A13EEE8.jpeg4DB71923-88BF-4BE8-8C90-0A82C99266A3.jpeg
      SquareBird in BirdCity

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