This kit is a Grade 8 Stainless Steel ARP (American Racing Products) crank pulley bolt kit for the Nailhead engines. These are not only good looking, and don't rust, but they are super strong and have a polished finish. These bolts have a tensile strength of 170,000 psi. They have a 6 point head and a .625 diameter flange for easier access in the tight spots.
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