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112-3601 for jeep and amc products 258 cu / 4.2 Liter L-6

High Performance head bolts have a reduced wrenching hex and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 170,000 psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers. these have 1/2 -13 thread and a underhead lenght of 4.400