Voodoo and thumper are they based on 1.5 or 1.6 rocker ratio?

Discussion in 'Magnum Engine Swaps' started by 70Roadkill, Apr 10, 2018.

  1. 70Roadkill

    70Roadkill Well-Known Member

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    so I’m looking at the comp cams or voodoo roller cam and looking at the spec card it doesn’t specify 1.5 or 1.6 rocker ratio. Building a magnum engine with eddy heads and not sure if I need to do the math if the cams are based on 1.5 or if the specs are for a 1.6 and no need to figure out the math.

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  2. sireland67

    sireland67 Well-Known Member

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    Voodoo is 1.5
     
  3. Toluene56

    Toluene56 Well-Known Member

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    I believe they're 1.5.. usually they'll specify 1.6 i've noticed.
     
  4. 70aarcuda

    70aarcuda Master Hoader of SBM FABO Gold Member

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    take the lobe lift and multiply it by the rocker ratio and see if it matches the valve lift..

    and you will never have to ask that question again...lol
     
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    • 70Roadkill

      70Roadkill Well-Known Member

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      Thanks for the replies, helps a bunch. Looks like I’ll go down one size and figure out the ratio. Being the magnum a 1.6 ratio the ones I was considering will be too much. Going down one size with the 1.6 should get me back to what I was looking for.