Speedmaster PCE287.1027 4 Bolt 12Pt Main Bolt Kit for Chevy BBC

Chevy BBC 454 4 Bolt 12 Point Main Bolt Kit Speedmaster engine bolts and studs are premium-grade, race-quality studs 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 and high-strength 12-point nuts. Created from aircraft quality 8740 high tensile strength chromoly steel Ground and thread-rolled after heat treatment to ensure the exacting tolerances