Not Ranked
I asked the same question of the ARP rep for my header bolts. I was told that there is a chance of split lock washers cracking and they wanted nothing to do with that possible situation. The ARP guy said to torque the bolt - header bolts in my case - to the proper torque spec of 35 lbs. for my 418W with aluminum heads and the natural stretch of the aluminum will lock the bolt in place. Don't forget anti-seize compound. Mine are still in place 2 years later and have not loosened.
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