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Old 02-05-2006, 11:11 PM
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The reason is because they allow the fuel to atomize better, the castings are "cleaner" and the combustion chambers are shaped differently. Put simply they are more efficient than older heads and allow for a faster burn. The downside is they are iron.
This is a good read:

Last edited by NAIRB; 02-06-2006 at 11:33 AM. Reason: advertising link
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