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A word to the wise: They are not strong enough fto be used or head bolts, not that this was the intention. I dont believe ARP sells a "Split Lock Washer".
Those are not for High Performance Automotive use. Use a correct flat washer and a thread locking liquid such as Locktite.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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