Chevy BBC 454 Chromoly Head Bolt Kit These MidAir Series Manifolds includes

These MidAir Series Manifolds includes a 4150 Series 1200 CFM Billet Throttle Body

The main difference is that there is an open area under the plenum chamber

let a Speedmaster aluminum Competition series radiator give your high-powered race car the advantage

These Speedmaster aluminum water pump pulleys are made from a 356 aluminum alloy that is heat-treated to T-6 specs

They are designed to ensure belt retention at high rpm

Chevy BBC 454 Chromoly Head Bolt Kit These MidAir Series Manifolds includesSpeedmaster 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.