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Discussion Starter · #1 ·
If any one is using the ARP 400-1403 header studs for BBC. Stainless 12 point nuts. I need to know the wrench size for the 12 point nuts in the kit. Went on the ARP site they don't list the size. I guessing either 5/16" or 3/8" Like to know before I order them. Thanks.
 

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Don't remember ARP part number, but nut is 7/16 12 point for mine.
 

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Discussion Starter · #3 ·
Mike, Your correct 7/16" wrench size on all of there 3/8" header stud kits, Called and got it direct from ARP.
 
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