Chevy BBC 454 12 Point Head Stud Kit Manifolds are cast from steel

Manifolds are cast from steel molds

providing competition engine builders with the most accurate valvetrain components available today

This body has a much larger diameter then your existing throttle body

They are available for small and big block Chevys

look no further than Speedmaster

Chevy BBC 454 12 Point Head Stud Kit Manifolds are cast from steelSpeedmaster 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 with 12 point nuts and hardened parallel washers for an even load distribution and accurate torque readings.