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crf450 04 head on a 05 bottom end????

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I have a fresh topend from my 04 crf450r and I destroyed my cases but I have cases from a 05 crf450r can I use those what's the difference? Gasket kits are the same only thing I noticed different is 1st gear bushing is a bearing in 05 and front mount is a little wider what do you guys think? I follow up with results of build and any problems I run into if you think it wil work.

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