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I got my aluminum last fall 2010 and it had Chinese main studs. two friends got iron and both cam with Chinese main studs. And they look Chinese.
I got ARP main studs from Summit but Bill Mitchel had stud upgrade kits at the time??
My buddy with the iron world block phoned ARP about his main bolts in July 2011 and ARP said we don't know what's up with world they just sent us boxes and boxes of just studs back for credit???

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I got my Iron World block earlier this year.. like May or June and it had the ARP studs..