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help with 383 intake (mopar)

Discussion in 'The Hokey Ass Message Board' started by mattrod68, Mar 6, 2007.

  1. mattrod68
    Joined: Jan 22, 2007
    Posts: 438

    mattrod68
    Member

    ok so my daily driver (1968 chrysler newport) was leaking all around the intake manifold ports. and im in the process of replacing the gaskets. ok heres the rub, i took off the manifold and there is no gasket besides the metal ones attached to the valley pan. and theres no sealant on the heads or the manifold. is this right? when i bought the gasket kit i had to buy the pan and the gasket separately, but the pan still has the metal sides and the manifold gasket is two per side, almost like i should sandwich the metal in between the fiber ones, does this sound right?

    sorry for the long question if its incoherent i will try to explain better. thanks in advance!

    matt
     
  2. mattrod68
    Joined: Jan 22, 2007
    Posts: 438

    mattrod68
    Member

    cmon, nuthin?
     
  3. dadseh
    Joined: May 13, 2001
    Posts: 517

    dadseh
    Member

    clear as mud
     
  4. Wesley
    Joined: Aug 12, 2006
    Posts: 1,671

    Wesley
    Member

    the big block dodge uses only thesteel valley pan as a gasket and no sealant is needed. If you still have leaks after replacing the gasket I would suspect the problem is a warped manifold. I used to have a 383 in a charger that I would swap out the stockmanifold with a high rise and a 850 holley just about every weekend for racing and then put the stock manifold and carb back on for daily driving and all I ever used was the steel valley gasket, I could usually get away with using the gasket a couple of times with out replacing it, although in hindsight I dont recommend reusing the gasket.
     
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  5. JOECOOL
    Joined: Jan 13, 2004
    Posts: 1,783

    JOECOOL
    Member

    aluminum manifolds may not compress the gasket well enough to not leak,Chrysler started making paper gaskets available in mid 69 when the 6 bbls came out. I suspect thats what you are supposed to use. The ones from Chrysler were very thin and were used top and bottom on the steel gasket (dry) with a dab of sealer on the corners of the valley. Hope this helps.
     
  6. mattrod68
    Joined: Jan 22, 2007
    Posts: 438

    mattrod68
    Member

    it is a cast iron manifold so it seems like it would compress the gasket ok. thanks alot guys:)

    matt
     
  7. I think I remember the Fel-Pro embossed steel gasket for the BB MoPar wedge engines coming with a little tube of sealant. The sealant is very similar to the Permatex liquid Aviation Sealer (purplish black sticky liquid stuff, not RTV). A film of that stuff on the gasket surfaces and bolt threads and your manifold won't leak.

    http://www.amazon.com/Permatex-8001...6?ie=UTF8&s=automotive&qid=1173300515&sr=1-13

    Trying to sandwich those paper gaskets in there is very difficult unless you had the manifold or heads milled to make up for the additional thickness.
     
  8. LoBrow
    Joined: Mar 8, 2005
    Posts: 612

    LoBrow
    Member
    from MI

    On my RB (440) engines I dab a little anearobic sealer around the ports to hold it in place when replacing the intake manifold. I have never had trouble sealing one. Some of my racing buddies use the valley tray as well as regular gaskets, but they soak the gasket in oil and reuse it each time. Good luck.
     
  9. 51 wayfarer
    Joined: Sep 15, 2006
    Posts: 28

    51 wayfarer
    Member
    from DENVER

    I've got a 68' 383 and I don't have any gaskets just the valley pan to the heads. It shocked me the first time I took it off. I would think that the heavy ass intake would seal that up safely without a gasket. Never had a problem with mine.
     
  10. SinisterCustom
    Joined: Feb 18, 2004
    Posts: 8,209

    SinisterCustom
    Member

    YEP...Stock uses JUST the metal vally pan....now on my 440 I used the valley pan AND gaskets on top of that, because I used thicker head gaskets to lower the comp ratio....otherwise the ports won't line up, vacuum leak...
     

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