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Technical 318 Intake Gasket help

Discussion in 'The Hokey Ass Message Board' started by Sharpone, Jan 13, 2025.

  1. Sharpone
    Joined: Jul 25, 2022
    Posts: 1,860

    Sharpone
    Member

    IMG_2899.jpeg IMG_2900.jpeg IMG_2901.jpeg I ordered intake gaskets for a Mopar 318, I received steel gaskets. I’ve never used steel intake gaskets. I have an aftermarket aluminum intake.
    My questions are:
    -Are the steel gaskets OK for use with aluminum intake manifolds? Or are they for cast iron only?
    -The installation tips sheet says to use a thin coat of sealer on the underside of the intake ports, should I use some on the coolant ports also?
    -Should I purchase a fiber type gasket instead? Elderbrock, Cometic, etc?
    Any insight or experience is appreciated!
    Thanks
    Dan
     
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  2. I use them on everything including aluminum intakes. I follow the directions and have never had a problem.
     
  3. Budget36
    Joined: Nov 29, 2014
    Posts: 14,879

    Budget36
    Member

    Heck, I never knew steel shim intake gaskets were even made.
     
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  4. I’ve used them on an Oldsmobile, I would put a coat of Copper Spray gasket on them first.
     
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  5. SS327
    Joined: Sep 11, 2017
    Posts: 3,395

    SS327

    Throw away the cork end seals and use Ultra black silicone bead in their place.
     
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  6. garyf
    Joined: Aug 11, 2006
    Posts: 333

    garyf
    Member

    318s always used steel. 360s used the paper. 3m yellow on the cork end rails on block side only,allow to dry completely so they wont push out.Bead rtv between cork and steel corners.
     
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  7. Sharpone
    Joined: Jul 25, 2022
    Posts: 1,860

    Sharpone
    Member

    Thank you all.
    SS327 the only time I use only RTV is if I can’t get the seal to stay put.
    I thought about copper seal on both sides, but the do I still use the supplied RTV on the under of the ports?
    I’ve had good results with copper coat but never used it in conjunction with RTV
    Dan
     
  8. SS327
    Joined: Sep 11, 2017
    Posts: 3,395

    SS327

    I used to coat lightly on both sides of the water ports with the ultra black. (Super thin)
    Ends use the ultra black silicone. Silver paint or copper coat around ports.
     
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  9. HSF
    Joined: Oct 25, 2014
    Posts: 245

    HSF
    Member
    from Lodi CA

    Gasgacinch. Getting harder to find but it's out there.
     
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  10. lemondana
    Joined: Feb 21, 2009
    Posts: 284

    lemondana
    Member
    from Lincoln NE

    FelPro 1243 is the High Perf intake gasket set for the 273-318. It is the printoseal style, and I like to use these with an aluminum intake.
     
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  11. Personally, I would not combine Copper Coat and RTV. RTV is fine for the end seals.
     
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  12. Budget36
    Joined: Nov 29, 2014
    Posts: 14,879

    Budget36
    Member

    I didn’t know 318’s used that type of gasket. I didn’t strip mine before taking it to the shop some 25/30 years ago, but a few weeks back pulled the intake and heads, just a “normal” felpro.
    Is there a reason 318’s used them?
     
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  13. garyf
    Joined: Aug 11, 2006
    Posts: 333

    garyf
    Member

    318 had smaller ports than 360-340,the reason for Chrysler smallblock gasket difference
     
    Last edited: Jan 14, 2025
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  14. RodStRace
    Joined: Dec 7, 2007
    Posts: 6,745

    RodStRace
    Member

    I know they were used and successfully. When I've replaced them, I've always moved to the fiber replacements. Just peace of mind, due to not squaring both surfaces and not wanting dissimilar metal contact, even though the bolts are also steel. The others have offered suggestions for ensuring a good seal. Your choice.
     
    Last edited: Jan 14, 2025
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