Running in rpm, raising rev limit later?

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ok champ. i build engines... dont baby the motor, dont listen to those "dont go past 3500rpm"

Drive it semi hard, put load on the motor and thats not to say to throw it in 4th gear n just step on the gas goin up a hill

If ur gonna go to 9k, then i suggest u drive it to around 7-8k

dont let it idle for long, dont use shit fuel and make sure u use running in oil for atleast 1000km and after that use high quality oils

Just drive it like u normally would, but dont thrash the shit outta it.

Change cams whenever u like, the motor wont mind it

He is asking the negative effects of only initially using only ~80% of a motors rpm range, not specifically run-in methods (since he obviously has an idea of the one you had in mind, with the mention of high rpm). Where did you get the 7k-8k figure from? Reasoned calculation or random guess?

Go and find a decent mechanical engineer because you won't get a very good answer on these forums.

What motor are we talking about here? If it's a non-vtec, give up. Revving non-vtecs to 9000 is going to make your life a nightmare. If it's a vtec, then the stock cams will still make power to 8000 regardless; so I fail to see the problem