103 Head Question

Discussion in 'Engine, Fuel and Exhaust' started by Rod Stewart, Oct 9, 2012.

  1. Rod Stewart

    Rod Stewart Active Member

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    Anyone know the chamber volume of the stock HD 103 heads?
    Is it the same 85 cc as for all previous stock twin cam engines?

    Thanks,
    Rod
     
  2. Bodeen

    Bodeen Well-Known Member Staff Member Moderator Contributor

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    I read somewhere that they are 85cc's but cant be sure.
     
  3. dolt

    dolt Senior Member Contributor

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    Bathtub chamber volume typically runs between 85cc-86cc but I have seen them measure as high as 89cc.
     
  4. BUBBIE

    BUBBIE Well-Known Member

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    I just had a set of 08 heads re-newed and blueprinted by "Deweys Heads" of Wa.
    Like dolt said above, one of mine was very far apart of the other.. so accurate measurement is needed to get them equal... And a good head man to check... Thanks Don Doorfman...

    I Know of No difference in the stock heads, being either 88", 95", 96" or the 103". Same..

    85cc

    Looking at Big Boyz caculator, they call out for 85cc as their stock starting numbers.

    signed....BUBBIE
     
  5. FishHunter

    FishHunter Active Member

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    They average between 85-87 cc's.
    A good cfm, for a 103-107 ci engine is right around 160 cfm, @ 10"/.600" lift.:)
     
  6. Rod Stewart

    Rod Stewart Active Member

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    Thanks to all for the info.
    I am slowly getting my head around all the head variations.

    The best,
    Rod
     
  7. FishHunter

    FishHunter Active Member

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    Rod,
    Do you know of an outfit, in Edmonton, by the name of Fabmasters Ltd.?
     
  8. Rod Stewart

    Rod Stewart Active Member

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    FishHunter;
    I am not familiar with Fabmasters. What do they do?

    Harley made Screaming Eagle 103 heads for a while.
    Anyone know the chamber volume and valve sizes for these?

    Thanks,
    Rod
     
  9. dolt

    dolt Senior Member Contributor

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    Need part numbers.
     
  10. FishHunter

    FishHunter Active Member

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    Yes, part #'s for the particular cylinder head would aid greatly to arrive at a conclusive answer.:)