Valve cover gasket issue.

Early C Bodies - The Slab Side Years

  1. LocuMob

    LocuMob Fluid Technician with a hat FCBO Gold Member

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    Someone needs to revive it!
     
  2. 66Hardtop

    66Hardtop New Member

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    And it's leaking again. It keeps blowing out between the 2 bolts towards the back with the 2 cork ones I've tried. Trying the rubber ones again.
     
  3. BLUPORT

    BLUPORT Carpe Diem Cras FCBO Gold Member

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  4. 1978 NYB

    1978 NYB Warfighter FCBO Gold Member

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    I would check the valve cover gasket surface for straightness.
     
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  5. The Goose

    The Goose Senior Member

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    Or pull the cover and hammer flat all the bolt holes. Like was said a few posts back, over tightening will collapse the valve cover holes and it’ll never be right. Tiny bit of silicorn on the valve cover bolt might keep it from backing out if they’re vibrating loose. Good luck I use cork never an issue.
     
  6. jcloving

    jcloving Member

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    Here is my procedure for valve cover gaskets/oil pan gaskets:

    Purchase felpro silicone gaskets with bushings at bolt holes
    Purchase new tube of permatex ultra black
    Clean valve covers thoroughly, especially sealing surface with solvent. Straighten/flatten if needed.
    Clean head sealing surface with solvent.
    Apply thin bead of silicone to valve cover and install gasket.
    Apply thin bead of silicone to head sealing surface
    Install valve cover with gasket and tighten bolts till just snug.
    Sleep on it.
    Next day, tighten valve cover bolts to torque spec.

    The silicone will "glue" the valve covers down to the head but it will keep them from leaking. I rarely remove my valve covers anyway. When I do a dead blow hammer helps.

    No leaks.
     
  7. Newport 66

    Newport 66 Senior Member FCBO Gold Member

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    I just got a set of 4 bolt valve chrome valve covers for my max wedge project and spent about 2 hrs peeling the old silicone gaskets off of them. The previous guy had gotten carried away with the black RTV sealant. From the looks of the covers they were leaking anyway.

    20190417_120825.jpg

    20190417_120836.jpg
     
  8. BIGBARNEYCARS

    BIGBARNEYCARS Senior Member FCBO Gold Member

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  9. BLUPORT

    BLUPORT Carpe Diem Cras FCBO Gold Member

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    ask.jpg
     
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  10. furious70

    furious70 Active Member

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  11. 66Hardtop

    66Hardtop New Member

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    I ended up buying a different cover. After checking it my original one was warped pretty bad. All is well now with a new Fel Pro rubber gasket. One of the bolts cross threaded and when drilling it to put a helicoil in I hit the water jacket but got that sealed up nicely and a fresh oil change.
     
  12. 1978 NYB

    1978 NYB Warfighter FCBO Gold Member

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    Glad you got it under control.
     
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  13. BillGrissom

    BillGrissom Active Member

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    Leaks from the rear of the valve covers have driven me crazy for years on my 1965 Newport. The problem appears that the heads don't have a flat sealing surface. It is a rough casting and drops away ~1/8" at the rear. I have negligible blow-by (new short-block & restored heads), so the crankcase even runs at a slight vacuum w/ the PCV. I have tried everything, including the foam silicone sealant, yet it still drips oil onto the starter. Last pass, I tried Real Gasket, which is firm silicone, under a cast-aluminum Holley valve cover. I thought to first try tightening it more at the rear to insure the gap is closed there. As I tightened the forward nuts, the ear on the rear of the cover snapped off, ruining the cover. The surface is that non-flat. Now that I have a milling machine, my "final solution" is to remove the heads and try to mill a flat surface all around. That may put the interface below the oil level, but shouldn't matter. I will also mill off the casting line which tends to stop oil from draining back. I tried that before w/ heads on engine, being careful to collect all shavings (stuffed rags & vacuum). If I botch the heads, I will switch to aluminum heads, which wouldn't be a terrible result (save ~50 lb).
     
  14. BIGBARNEYCARS

    BIGBARNEYCARS Senior Member FCBO Gold Member

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    Bill, Big-M Automotive iz only an hour north of you in Williams. Call 'um at: 530-473-2225 and tell 'um what head # you need. I'm not sure what head Mother used on the '65s?
    But more then likely Williams will have it. Way easier then going thru' the machining process. Then re-use the "RED" Real Gasket from Tennessee after you've cleaned it up and torque to their specs. 16 in. lbs. if I remember right? But it goes on DRY per their instructions. No better gasket on the Planet. Just look at what they produce for the Air Plane Industry. Brake Clean spray can on the head and the rocker cover mating surfaces if you want it clean and dry. It'll only take ah minute to evaporate, Jer
     
    Last edited: Jul 5, 2019
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