Speedmaster cylinder head fasteners are manufactured from aircraft-quality 8740 high-tensile strength chromoly steel and cold-forged to ensure molecular integrity. Each fastener is heat-treated prior to thread rolling and machining, then topped off with a black oxide finish for added durability. Speedmaster fasteners are rated at 190,000 psi, and kits come complete with 12-point nuts and hardened parallel washers for an even load distribution and accurate torque readings.
