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Return to Parts List Category : A- Small Block "LA" : Fasteners : Cylinder Head : Bolts ARP 144-3606 SB WEDGE W/INDY "X" HEX HEAD BOLTS FITS RHS/INDY IRON MAGNUM & LA STYLE HEADS $91.72 ARP Brand Hex Headed Bolts. These ARP High Performance series head bolt are rated at 170,000 psi--15 percent stronger than Grade 8 fasteners. These will also work with the Iron Ram (EQ) and factory OEM styel Magnum heads.