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If you want to have more power from your YZ450F cylinder head, send it to us and we will take care of the rest. We will fully port and polish the head, with a reasonable turn around time. This is for all '03-14 YZ450F heads, and it will be a nice boost to your stock or built motor. Send us your bare, torn down head. For an additional cost we can tear the head down and/or reassemble the head with your OEM or Kibblewhite parts. Contact us for details. Email email@example.com or call us at 909-782-8012 with any questions. Se habla español.