Question about cutting valve guides 4 seals

Small Block Mopar Engine

Is there a better way of doing this?

  1. Yes. Please explain

  2. No

  3. I'm hungry. Going to eat and think about life.

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  1. Jadaharabi

    Jadaharabi FABO Gold Member FABO Gold Member

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    Okay I am cutting on a pair of 308 heads for the valve stem seals. I am installing the Howard dual Springs for a roller hydraulic cam. I have a couple of questions that maybe some of you fellows can answer that work on heads for me.
    Okay do I remove the step next to the valve stem on the head for my innerspring to sit flush with my outer spring?
    I am cutting these for the .531 seals. They have already been cut for a bigger seal when they were done by Indy aero heads.
    I have cut down to the step on the head on the end 2.

    16018876918188247620725061957816.jpg

    As you can see whoever prep these heads cut all the guides down short.

    1601887769532265720543189281860.jpg

    16018879085343350861262251453145.jpg

    The set I bought. Howard's 98438-K32 for 3/8 stems.

    98438-K32.jpg

    Screenshot_20201005-043430_Chrome.jpg

    The close out sheet has a 100 of these seals for $22.68.
     
    Last edited: Oct 5, 2020
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    • Mopar Sam

      Mopar Sam Well Fed Member

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      Yes, you want both springs to set flush with each other at the bottom of the spring pad. Otherwise, the inner spring may coil bind.
       
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      • brian6pac

        brian6pac Well-Known Member

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        I leave it if there is room, helps keep the bottom of the spring from walking around, if you cut it you should use a spring locator, plus it gives you more spring pressure

        4704-16_600.jpg
         
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        • C130 Chief

          C130 Chief Mechanical Genius

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          Have you checked the inner spring only for coil bind with the step? Does the outer spring fit around the step? Inner springs are typically a thinner wire so they will not bind at the same height. It might be beneficial to leave it to keep the springs separated. If the inner are wound the opposite direction from the outer coils it might not be such a big deal. Also some spring sets have a counter-wound flat spring to keep the coils from getting caught in each other.
           
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          • Jadaharabi

            Jadaharabi FABO Gold Member FABO Gold Member

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            Thanks to all. I called Howard Cams. Was told to remove the step and the spring is big enough that it fills the pocket in the head so it won't be going walk about.
             
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            • Mopar Sam

              Mopar Sam Well Fed Member

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              I should have added above that your seat pressure #s from the spring manufacturer are spec'd with the springs setting at the same height on the bottom.
               
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              • MOPAROFFICIAL

                MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                I'm not sure about where some manufactures base their spec #s , they don't print th correct info..or they base it off using the step, because the seat psi is light 15 lbs with a set I just checked. Comp cams.
                Most inner coils have more room to collapse than the outer. I was always thought to cut the inner step to locate the innner spring . It's easier on the guide and less spring harmonics... But ultimately the goal is to obtain a particular seat and open pressure of said spring...so if it takes leaving the step to attain that advertised pressure... and you have plenty of clearance to...then leaving it could be an option...or getting a better spring that physically specs as advertised.
                Typically you cut them to fit to locate the inner.
                 
                Last edited: Oct 5, 2020
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                • MOPAROFFICIAL

                  MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                  I think you should get yourself a spring pressure tester and not just guess because you could find out you have a lot less or more than you thought
                   
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                  • Wyrmrider

                    Wyrmrider Well-Known Member

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                    ixnay on the teflon seals
                    what size now
                    I like the 031 better than the 000 but nothing wrong with 9/16
                    use biggest that will fot in your inner spring
                    get viton seals
                     
                  • RustyRatRod

                    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                    That was going to be my recommendation. To call the manufacturer. Depending on the spring I have seen some recommend removing the step and some not. Good call.
                     
                  • Jadaharabi

                    Jadaharabi FABO Gold Member FABO Gold Member

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                    What do you see wrong about the teflon seals?
                     
                  • MOPAROFFICIAL

                    MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                    As I've said before, they wear the stems and dont really meter the oil once you have some miles on it. We know seals let some oil in, They have to , there is vacuum on the guide...but some do better than others at metering it.
                     
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                    • Jadaharabi

                      Jadaharabi FABO Gold Member FABO Gold Member

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                      Inner spring ID is .807
                      .562 seal OD is .665
                      Differance of .142
                      Divide by 2. = .071. Clearance

                      Is that enough?

                      I know the .531s have plenty of clearance but if the .562 will work I would like to save some guide metal.
                       
                      Last edited: Oct 6, 2020
                    • Wyrmrider

                      Wyrmrider Well-Known Member

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                      teflon seals do not controloil as well as viton
                      they are too stiff
                      do a search
                       
                    • Jadaharabi

                      Jadaharabi FABO Gold Member FABO Gold Member

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                      Ok I got me some .530 Vitons.

                      16020935045764922957010820288904.jpg
                       
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                      • Wyrmrider

                        Wyrmrider Well-Known Member

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                        good moove
                        make sure you have a good finish on your valve stems
                        some cheap valves have the finish of files
                        I put a fine finih with a Sunnen stem hone to give a nice crosshatch but a few strokes with some wet or dry paper works
                         
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