ARP 2033902 Professional Series Cylinder Head Bolts, 12-Point Style, For Select Toyota Applications Professional Series cylinder head bolts are premium fasteners for competition components Rated nominally at 200,000 psi, which is substantially stronger than Grade 8 hardware Wide area flanged head eliminates the need for valve train removal to facilitate cylinder head retorquing Features reduced wrenching 12-point style heads Comes complete with hardened parallel-ground washers