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Clearance around spring seats

Discussion in 'V8 Development and Modification' started by keith reed, Oct 3, 2019.

  1. keith reed

    keith reed Well-Known Member

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    I am getting beehive seats that have a base diameter of 1.29" for my vn v8 cylinder heads. How much clearance do I require around the spring seats? At the moment I have 1.294". Will this be enough? Thanks Keith
     
  2. immortality

    immortality Can't live without smoky bacon! Staff Member

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    .004" clearance... IF the spring seat is located on the valve guide than it shouldn't move so may be ok.
     
  3. keith reed

    keith reed Well-Known Member

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    Thanks Immorality. I contacted Comp cams, they say as tight as possible so the spring does not move around.
     
  4. immortality

    immortality Can't live without smoky bacon! Staff Member

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    Yeah, there are 2 kinds of spring seats, the ones that locate on the OD and the ones that locate on the ID (the valve guide). I like the ID type but I guess it would require machining the guide. I was going to try em on my next build, same as you, beehives on a 304 :)
     
    Last edited: Oct 7, 2019
  5. Deuce

    Deuce Super Stock

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    1.29 sounds really narrow. Aren't they more like 1.45"?
    What diameter at top of beehive?
     
  6. keith reed

    keith reed Well-Known Member

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    Outside diameter at the top is 1.055". The spring is 26915 from Comp cams. I supplied them the cam details
    plus the spring base diameter and that is what they advised.
     
  7. shane_3800

    shane_3800 Active Member

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    May I ask what cam, roller or flat?
     
  8. keith reed

    keith reed Well-Known Member

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    I am chopping and changing but these springs suit both roller or flat up to 600 lift.
     
  9. shane_3800

    shane_3800 Active Member

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    I have the same issue. Slowly starting to fix my 5l it used to be roller but I holed the block. I would rather not use tie bars so I'm thinking I might just go flat tappet. Don't know what cam specs I need yet though as the heads I'm using have bigger valves. One certainty is I'll be using the TP dual plane low rise with a carb in my VS so 6500rpm is the limit.
     
  10. keith reed

    keith reed Well-Known Member

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    I have just received my comp cams beehive springs from Competition engines. They cost including freight $298. This does not include the retainers or collets that I had already bought. Some outfits are asking well over $400 for the same springs.
     
  11. shane_3800

    shane_3800 Active Member

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    Thanks. Will defiantly look into this.
     

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