Valve stem seals

Small Block Mopar Engine

  1. barracudadave67

    barracudadave67 FABO Gold Member FABO Gold Member

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    OK. So Im puting my J heads back together, and have a dump question.
    Im using Felpro # SS70014 OE style valve stem seals.
    My question is, "how does the intake seal fit the valve guide" (its stock, not machined down),??? Does it get pushed down on the guide,??? or does it just get slid on the valve stem, and left touching the guide as the stem goes up, and down,???.
    It seems too small to get pushed down on the guide.
    I know the exhaust seal dosnt get pushed on.
    I need enlightening.
    Thanks
    Dave
     
  2. perfacar

    perfacar Well-Known Member

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    usually they are pushed down on guide
     
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    • oldkimmer

      oldkimmer FABO Gold Member FABO Gold Member

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      I push them down as far as they can go. Once u crank the engine over they will find their place. Kim
       
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      • yellow rose

        yellow rose Overnight Sensation FABO Gold Member

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        It’s not a very good seal. I won’t use them. It just slides over the valve stem and rides there.
         
      • barracudadave67

        barracudadave67 FABO Gold Member FABO Gold Member

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        Y R
        What seals do you suggest,??. I am confused buy this. I don't want to get the guides machined, they are stoc factory. I just want a good seal.
        Thanks
        Dave
         
      • oldkimmer

        oldkimmer FABO Gold Member FABO Gold Member

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        An umbrella seal will last for 10 years or more. Use them and don’t look back. They were factory on every Mopar for decades. Kim
         
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        • barracudadave67

          barracudadave67 FABO Gold Member FABO Gold Member

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          Do they get pushed down on the head guides,???, or just on the valve stem. the intake seals seem kind of small to be pushed on the guides. This is whats got me confused.
          Thanks
          Dave
           
        • Wyrmrider

          Wyrmrider Well-Known Member

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          umbrella seals they float
          what yr says
          and they do not hold up
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          Just push them down to the guide, not over. They only have to shed oil over the guide. Kim
           
        • nm9stheham

          nm9stheham Well-Known Member

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          As above... they are 'umbrella' seals... the oil gets on them and then is shed off the edges, away from the guides. So it does not matter exactly where they ride vertically.

          I'll admit that I am a bit confused if they are smaller ID than the guide OD....
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          I think he means the inside of the seal seems to small. Then the seal is a positive one without the spring band on it. Yes u can push them over the guide. I don’t like how they fit that way they buldge out so I just slide them down to the guide. They find their own happy place as soon as the motor spins over. Kim
           
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          • PRH

            PRH Well-Known Member

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            Left - umbrella, rides up and down with the valve

            Right - factory style positive seal, grips guide and wipes oil from valve stem.

            The positive seals expand a lot when pushed onto the guide....... that’s normal.

            Either one will work fine for a mild build.
            Install what you have and move on.

            4382AB68-83EC-401F-8C3D-56C555C030C5.jpeg

            BB250508-C7D7-4084-8638-B2FF24D33F70.jpeg
             
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            • 66fs

              66fs FABO Gold Member FABO Gold Member

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              Those, Felpro # SS70014, are the good Viton seals. The intake seals get pushed down to grab the outer valve guide. Use the sleeve and oil on the valve tip to keep from damaging the seal. The short umbrellas go on the exhaust valves. They last forever, but I have never used them on dual valve springs.
               
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              • PRH

                PRH Well-Known Member

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                Yes...... if your seal set has 1/2 umbrella seals and 1/2 posi seals...... the posi seals would get used on the intake valves.

                And neither will usually fit inside a dual spring.
                 
              • 4spdragtop

                4spdragtop CONGRATS NORTH AMERICA!

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                Heres link from Mancini, I used felpro posi locks I believe.
                Valve Seals
                 
              • toolmanmike

                toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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                Do you have to machine the guides for those?
                 
              • yellow rose

                yellow rose Overnight Sensation FABO Gold Member

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                I’m not sure why all the love for a cheap, crap valve stem seal. I understand that you have them, but so what?

                If the heads are still apart, take them to a shop and have them machine the top of the guide for a positive seal. It may already be done, but you need to post a picture, or measure the OD of the guide.

                Ring seal today is nothing like it was. Running a cheap seal like that just isn’t worth it to me. I mean, look at the junk shit Chevrolet sent out...a square rubber o ring at the top of the valve, just under the keeper. Worked half assed back then, but no self respecting machinist or engine builder would use those today (I hope they wouldn’t).
                 
              • barracudadave67

                barracudadave67 FABO Gold Member FABO Gold Member

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                Thanks for all the replies.
                I geuss I'm making a mtn out of a mole hill.
                Heres what I have to work with.
                None of these are for machined guides
                Only the Felpro seals, and the intake seals on the far right are the kind that goes over the guide.
                The red ones are for intake, & exhaust they also have a spring retainer on them. They do not stay on the guides.
                The Comp seals are longer than the others, and do not stay over the guides.
                Thanks for all the replies, as I am not an engine guy, and get cornfused.
                Dave

                20200605_155023.jpg
                 
              • 66fs

                66fs FABO Gold Member FABO Gold Member

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                The Fel-Pro intake seals are positive Viton seals. No machining or machinist necessary. No need for a positive seal on the exhaust valves.
                 
              • PRH

                PRH Well-Known Member

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                Assuming the guide bosses are still as originally machined, and you’ll be using single springs.......Of that assortment in the pic, the Fel-Pros are what I’d use.
                 
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                • oldkimmer

                  oldkimmer FABO Gold Member FABO Gold Member

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                  Fel Pro. Big on intake. Small on exhaust. They have been used forever. Kim
                   
                • Wyrmrider

                  Wyrmrider Well-Known Member

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                  There are better seals
                  the neoprene fel pros end up in the pan unless you run stock revs and no long pulls up hills
                  check the truck listings
                  or the BBC HD umbrella seals if they fit inside SBM springs I've used these in BBM
                  there are both Silicone and Viton
                  other engines with 3/8 stems like FE fords
                  a problem with stock umbrella seals is they loose control with high rpm operation as well as high temp (center two exhausts)
                  what are the MP seals made of that mancini sells- the ones on the right
                  the next ones look like teflon seals- pass
                  the comp ones are suspicious
                  I do not see how you can have positive seals without cutting the guides
                  check out those mp seals
                  they are most likely availavle from multiple sources once you determine the materiel
                   
                • barracudadave67

                  barracudadave67 FABO Gold Member FABO Gold Member

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                  Well I put them together. I used the Felpro. So we will see. Hopefully they will outlast me. I'm old, lol.
                  Now I have to get to work on the block.
                  Thanks for all the info. And advice.
                  I appreciate it all.

                  20200605_184511.jpg
                   
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                  • oldkimmer

                    oldkimmer FABO Gold Member FABO Gold Member

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                    Good deal. In a near stock environment they will last for many years. Kim
                     
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