oversized valves for a wr450

i had a question for experienced people out there, will i run into cam issues if i go 1mm oversized on some valve work on the head of my 2005 wr450? since i am in recovery mode this summer i want to port / polish the head and oversize the valves...if anyone has any experience with that could you reply...

and 2ndly, would it make a significant difference in power for the cost...

thanks

so no one has experience with a 1mm over size valve on a yamaha? i guess i will be the first guy to try it...

i will let you all know when i get it done...

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