Chevy BBC 454 Chromoly Head Bolt Kit Their performance

Their performance

These kits include all of the necessary external block freeze plugs

which allow you to modify your cam timing

Nothing lasts forever

Speedmaster cylinder head fasteners are made from aircraft quality 8740 high tensile strength chromoly steel and cold-forged to ensure molecular integrity

Chevy BBC 454 Chromoly Head Bolt Kit Their performanceSpeedmaster cylinder head fasteners are made from aircraft quality 8740 high tensile strength chromoly steel and cold forged to ensure molecular integrity. They are heat treated prior to thread rolling and machining and are rated at a whopping 190,000 psi. All kits come complete hardened parallel washers for an even load distribution and accurate torque readings.