Chevy BBC 454 Chromoly Head Bolt Kit They are designed to ensure

They are designed to ensure belt retention at high rpm

They do this using a unique design in which cooling tubes draw cool air through the transmission fluid

rear-end housings

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

Speedmaster cast iron brake calipers include calipers

Chevy BBC 454 Chromoly Head Bolt Kit They are designed to ensureSpeedmaster 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.