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Old 12-18-2008, 09:23 AM
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ARP Nuts

ARP connecting rod nuts have one side plain, and the other side has a series of concentric grooves. Which side goes against the rod cap?

I assume the grooved side, as they must be there for a reason. Is this correct and does anybody know the reason?

My best guess is the grooves hold oil for lubrication which means a more accurate torque application, but I really don't know.

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Old 12-18-2008, 11:49 AM
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It dosen't matter which way it go. All that marking is the nut grade code.
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