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I assume that the offset keys are to compensate for the slight differences in machining and resulting differences in cam timing even with a new chain.
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You must have found Beagle's post. Very interesting article.
What method did you use to determine chain stretch?
The only way to tell if there is an offset key installed is to get in there and check it. If you remove the sprocket bolt you can probably see if the sprocket keyway is offset from the cam keyway.
If that doesn't work you will have to remove the sprocket.
I think it would be a safe bet to assume there is no offset installed. Especially since your IP was off so much.
Danny