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2003 WR450F Cylinder Head Replacement

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Just to make absolutely sure, can I replace a 2003 WR450F head with a 2005 YZ450F head? I understand the exhaust cam differences. Will install the WR cams in the new head. Thanks

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Well, the 03 WR and 05 YZ heads are different p/n's, but the WR and YZ used the same head in '03. I'm not sure what the change was, but it may just be that the newer heads don't have the hole above the exhaust port for manual compression release, which doesn't need to be there anyway.

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