Correct way to install lower intake manifold -> head gaskets

Discussion in 'Fox 5.0 Mustang Tech' started by JasinC19, Feb 19, 2012.

  1. JasinC19

    JasinC19 What hole is this!?!

    Joined:
    Jun 8, 2011
    Messages:
    305
    Likes Received:
    2
    Trophy Points:
    19
    I've read a few different opinions.

    I have brand new heads/intake manifold. The gaskets between the head and intake manifold (intake ports): do I need any RTV on them? They are Fel-Pro gaskets.

    I was going to just put some high tack gasket sealer on each side to hold them in place, put a bead of black permatex on the block rails and put the intake manifold down on top of everything.

    Opinions?
     
    #1
  2. foxbodymike87

    foxbodymike87 Active Member

    Joined:
    Jul 13, 2011
    Messages:
    765
    Likes Received:
    31
    Trophy Points:
    39
    i put that orange permtex on the block rails and thats it
     
    #2
  3. Rick 91GT

    SN Certified Technician Site Sponsor

    Joined:
    Nov 30, 1999
    Messages:
    9,702
    Albums:
    1
    Likes Received:
    94
    Trophy Points:
    99
    Location:
    PA
    You need to put some permatex around the front and rear water passages on the head BEFORE you put the intake gaskets on. Use a nice bead across the front and rear rails...tq to 20ftlbs in the proper sequence.
     
    #3
  4. txstang84

    txstang84 Active Member

    Joined:
    May 21, 2005
    Messages:
    1,619
    Likes Received:
    27
    Trophy Points:
    49
    Location:
    Abilene, tx

    +1...

    Im sure you guys have had varied experiences, but I always wind up running the sequence about 4 times before they're all torqued to spec


    Sent from my iPhone using Tapatalk
     
    #4
  5. BlownFiveLiter

    BlownFiveLiter have car, will race....wait, it doesn't run

    Joined:
    Nov 30, 1999
    Messages:
    5,502
    Likes Received:
    25
    Trophy Points:
    88
    Location:
    Chicagoland
    Buy some threaded rod, or cut the heads off some bolts and put them in the corner bolt holes for the lower intake, so you can guide it down evenly. Otherwise, you may end up shifting the intake gaskets around and not even realize it.
     
    #5
    Doomstein likes this.
  6. Mary brown

    Mary brown Banned

    Joined:
    Feb 7, 2012
    Messages:
    24
    Likes Received:
    1
    Trophy Points:
    13
    Hmmmm ... I'm going to have to think about that one
    [​IMG]
    [​IMG]
     
    #6
  7. VibrantRedGT

    VibrantRedGT "STANGNET'S PENGUIN SMACKER"
    Super Mod

    Joined:
    Nov 30, 1999
    Messages:
    15,572
    Likes Received:
    221
    Trophy Points:
    114
    Location:
    Boca Raton, Florida
    I've done the long 1/2" threaded rod trick before. The lower intake comes right down and doesn't move forward or back at all. For first timers its a pretty good trick to ensure it doesn't shift. Like Rick said torque with the proper sequence.
     
    #7
  8. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor
    Admin Dude

    Joined:
    Jan 5, 1985
    Messages:
    20,621
    Showcase:
    59
    Albums:
    8
    Likes Received:
    2,678
    Trophy Points:
    174
    Location:
    Box behind Walmart
    :scratch:
     
    #8
  9. srtthis

    srtthis the guy doing it does every local racers rear end

    Joined:
    Jul 4, 2009
    Messages:
    3,935
    Likes Received:
    487
    Trophy Points:
    114
    Location:
    in the shop working!
    ive never had the gaskets shift on me. my head gaskets stuck out and the intake gaskets hung on them
     
    #9
  10. Maryland Stang

    Maryland Stang Active Member

    Joined:
    Aug 21, 2002
    Messages:
    1,659
    Likes Received:
    26
    Trophy Points:
    39
    Location:
    Greenville, NC
    Don't forget to use a steel core gasket. All paper gaskets are K-rap.
     
    #10
  11. JasinC19

    JasinC19 What hole is this!?!

    Joined:
    Jun 8, 2011
    Messages:
    305
    Likes Received:
    2
    Trophy Points:
    19
    Hmm.. yeah I read that, but didn't know how true it was. I used what came with the top end kit. Fel-Pro 1250 I believe. Someone recommended 1250s (steel core).

    If the paper only ones are that bad, I guess it would be worth it to take it back off and redo it. Does this go for the upper->lower intake manifold gasket as well?

    I wonder if Advance/Autozone/NAPA sells the steel core ones.
    EDIT: Actually I am having a hard time finding anyone that sells the steel core ones. Can someone point me in the direction of the "best" set to use?

    Thanks,
    Jason
     
    #11
  12. larrym1961

    larrym1961 Active Member

    Joined:
    Dec 18, 2010
    Messages:
    496
    Showcase:
    1
    Albums:
    1
    Likes Received:
    27
    Trophy Points:
    29
    Location:
    Idaho Falls Id
    While some members here have had good results with the Fel Pro 1250, I like a few others have not. The first set installed by a professional mechanic who builds his own race motors, and the second set by myself. And both sets litteraly melted causing a huge vaccume and coolant leak. Now I am on a third set of Fel Pros but this time I went with their MS93334 steel core intake gasket for 5.0 and have had no problem. 007 (3).JPG
     
    #12
  13. JasinC19

    JasinC19 What hole is this!?!

    Joined:
    Jun 8, 2011
    Messages:
    305
    Likes Received:
    2
    Trophy Points:
    19
    Geez.. yeah you just convinced me. Not a big deal to take the intake back off while it's on the stand. I can recheck my rails to see if I had a good RTV seal.

    Another thing: I torqued the manifold properly in 4 steps. A few minutes later I rechecked the torque and had to retorque the sequence two more times before the wrench stopped moving before clicking. Is this because of the gasket setting in and compressing? Will the steel core gaskets help with this or is this normal?

    Will I have to recheck the torque after the engine goes through some heat cycles?
     
    #13
  14. txstang84

    txstang84 Active Member

    Joined:
    May 21, 2005
    Messages:
    1,619
    Likes Received:
    27
    Trophy Points:
    49
    Location:
    Abilene, tx
    Yes
    Yes
    Yes...


    Sent from my iPhone using Tapatalk
     
    #14
  15. Doomstein

    Doomstein Member

    Joined:
    Apr 17, 2005
    Messages:
    36
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    Lakeland, FL
    ^^
    This!
     
    #15
  16. 87-t-top-gt

    87-t-top-gt Member

    Joined:
    Jan 30, 2012
    Messages:
    106
    Likes Received:
    3
    Trophy Points:
    18
    Location:
    annapolis, md
    sounds like a neat trick, will be doing the same in a couple weeks.
     
    #16
  17. JasinC19

    JasinC19 What hole is this!?!

    Joined:
    Jun 8, 2011
    Messages:
    305
    Likes Received:
    2
    Trophy Points:
    19
    I got the MS93334 intake manifold gaskets. Fel-Pro says they must be installed without any sealer. Trick flow says to outline water jackets with RTV black.

    What should I do?
     
    #17
  18. Cobra912

    Cobra912 Active Member

    Joined:
    May 1, 2005
    Messages:
    1,863
    Likes Received:
    9
    Trophy Points:
    39
    Location:
    Wish I was anywhere but here
    you can leave the RTV off but if the intake has any corrossion or pitting you might wanna do as Rick 91gt described above

    I have always used RTV even on new intakes and I have never had one leak or fail on me (stock, 1250, 1262 etc etc)
     
    #18
  19. JasinC19

    JasinC19 What hole is this!?!

    Joined:
    Jun 8, 2011
    Messages:
    305
    Likes Received:
    2
    Trophy Points:
    19
    Thanks... I'm sure this stuff been asked before, I just get a little gunshy sometimes
     
    #19
  20. JasinC19

    JasinC19 What hole is this!?!

    Joined:
    Jun 8, 2011
    Messages:
    305
    Likes Received:
    2
    Trophy Points:
    19
    By the way, I put sealer around the water jackets on the 1250's and did not let it sit overnight.

    I just took the manifold off a day later and the black had fused the gaskets to the block completely and utterly. I spent like 45 minutes cleaning everything up. The fat beads on the rails were still a tiny bit gooey in the center though.

    Pics to follow...
     
    #20

Share This Page