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09 10 Head vs 11 12 Are they interchangeable

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Just wondering if anyone knows the difference between the early FI heads and the later 11-12. I know the 11-12 uses a smaller TB but I wasn't sure if the newer ports were smaller to match the TB.

Reason I ask, I have a spare 09 head I'd like to have ported and coper seated, and install it on our 11. I can't measure head in the 11 because its not at home right now.

Thanks in advance

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there the same TUF can install the copper seats and port the head also .The Tuf head is one of the best performers also .this is the same head that Heath Voss used .

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there the same TUF can install the copper seats and port the head also .The Tuf head is one of the best performers also .this is the same head that Heath Voss used .

Ron - Do you know why there are different part numbers for the different years?

Thanks in advance

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