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Yz450 top end on wr 450 bottom end

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Hi guys ,bought a spare 03 wr450 engine for my 04.as I am putting it back together I see it has a yzf450 top end.head has 5XD on it. What would be benefits of using this head compared to the wr. My 04 engine has yz cams fitted off a 05 and goes great,but has a wr head.comparing the two heads the combustion area looks quite different

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Thanx for reply.so even though my 04 has the yzf exhaust cam off a 05,it will go even better in mid to top with whole head on? If so ,that would be a blast .As mine goes great with the cam mod already.

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