Chevy BBC 396 454 High Performance 12 Point Main Bolt Kit This makes them far superior

This makes them far superior to standard OEM fasteners in terms of durability

and use low-resistance terminals for maximum conductivity

Their performance

shiny or polished materials

Chevy BBC 396 454 High Performance 12 Point Main Bolt Kit This makes them far superiorSpeedmaster engine hardware are premium grade, race quality componets that are created from aircraft quality 8740 high tensile strength chromoly steel, withstanding up to 190,000 PSI . They are ground and thread rolled after heat treatment to ensure the exacting tolerances that Speedmaster requires for all of their fasteners. This ensures strength and consistent torque readings. All kits come complete with 4130 heat treated, parallel ground washers