Alan,

It doesn't say that you can change cam timing, in so many words. However, since it says you're allowed to return the cam timing to stock, via an offset key, if you mill the head, it is impled that, since you are not required to use the offset key, you are allowed to change the cam timing by whatever amount you get through milling the head.

My take on the intent of the rule, is that they don't want us to be able to change cam timing. But that's nothing more than my opinion.

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