ARP 4541503 Timing Cover And Water Pump Bolt Kit, Stainless Steel, 12-Point Style, For Select Ford 289-302 Aluminum Applications Add ARP's legendary quality to your project Manufactured from polished Stainless 300 steel, a proprietary alloy that is impervious to rust and corrosion Rated at 170,000 PSI, which is considerably stronger than Grade 8 hardware Bolts feature compact 12-point style heads Kit comes complete with high quality washers