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Did they do anything to the combustion chamber? If so that could be the cause.

it's only .5 cc.

sounds like they goofed, TFS TW's are 64 CC out of the box, I would have them cc'd somewhere else for a second opinion.

especially if they have been milled, that doesn't make sense. :confused:
 

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I asked the same thing when I got my TW heads ported and CC'd about 3 years ago and they measured 64cc. The shop said that all the TW heads that they had measured were between 64cc and 66cc! The valve job will have increased the volume, but it seems that the chamber volume as-shipped is no where near the 61cc that TFS advertises.

In my case it didn't matter, since I was getting them milled to 58cc anyway.
 

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I just had mine milled to 61.4cc from 64cc. I thought it was because of the work I had done to them previously but maybe not.
 

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What is the typical charge to have someone cc a combustion chamber? I hope my TW's aren't that large! Also, what is the typical charge to have a set of heads milled? Is an angle mill better because it allows the intake to line up better or is that the standard flat mill?
 
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