replacment head for 03 crf450r

I need to replace the head on a 2003 crf450r. Ive heard the 06 has updated valve guides. Is the 07 compatible?

I need to replace the head on a 2003 crf450r. Ive heard the 06 has updated valve guides. Is the 07 compatible?

The 07/08 head is the best head and it will work on your 03.

It looks like Ape an old drag race sorce is getting into the dirt bike market .selling ferrea spring kits originally desighed by RHC well @ least there selling quality parts.

Has any one used the Big Bore Thumpers heads? I was wondering about those, particularly the porting.

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