At what point would you step up to ferrea hollow stem valves

Mopar Racers Forum

  1. Killer6

    Killer6 Well-Known Member

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    The "econo" W2 heads used stock length 2.02 & 2.08 valves... Listed at 4.98", the full-on W2 & W5 heads used longer valves up to 2.15" dia., listed at 5.28" long....
     
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    • Duane

      Duane Well-Known Member

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      I don't recall the actual length of my valves, but they were the long valves that mp sold to get a 2.00 installed height. You need that height to get enough retainer to guide clear because of the cam lift,
      You also will have valve springs that will live longer because they taller. But this all makes the total assembly heavier as well.
       
    • Duane

      Duane Well-Known Member

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      That sound right.
       
    • rumblefish360

      rumblefish360 Getting closer FABO Gold Member

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      Thanks killer6. I was having a Brain fart last night on there length.
      Longer is heavier, but all so worth it.
       
    • Krooser

      Krooser Reform School Graduate

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      The 2.14 Ti valves I have weigh 85 grams with a 6 inch stem.
       
    • Krooser

      Krooser Reform School Graduate

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      The NASCAR stuff is usually 2.14 on a 6 or 7 mm stem and run 500 miles at 9 k.
       
    • Krooser

      Krooser Reform School Graduate

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      I installed longer 5/16 valves in my econo heads. The rocker stands were machined off when I bought the blown motor but had short valves. I am using T&D rockers.
       
    • Jeremiah

      Jeremiah Well-Known Member

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      I have not seen a sb2 motor with 2.14" intake valves. What platform are you speaking of? I have seen 2.1350" fwiw.
       
    • Duane

      Duane Well-Known Member

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      I think we are getting off topic here. I never said that smaller valve diameters would break or that they cannot be reliable in a given
      Setup. But if we agree that a hollow stem valve would be weaker
      Than a similar diameter solid valve stem, then that same logic tells us that a larger diameter solid stem valve would be stronger than a solid stem smaller diameter. By some standards an engine that only runs 500 miles would not be considered reliable. How many miles do you think a pro stock engine sees. NHRA passed new rpm limits to lessen the teams operating budgets due to valve train component costs. Those motors won't see 500 miles before the valve train is serviced. Top fuelers even less, so like I said it depends.
      The valve train setup is not really a sum of only one component, but of all the components in the valve train. Depending on the expected useage of the motor. IMHO
       
    • Killer6

      Killer6 Well-Known Member

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      As I said, they were prototypes, the member even posted a pic(s).....hoping they chime in....I know IQ52 was retiring from this stuff....not sure which forum/thread it's buried in....
       
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