BBF Head Bolt Kit 6pt.

The ARP BBF Head Bolt Kit 6pt (part number 155-3603) is a chromoly fastener assembly engineered for high-performance big block Ford engine applications. This kit delivers the clamping force and reliability demanded in modified engines where OEM hardware reaches its limits. The six-point hex head design provides superior engagement and resistance to rounding compared to twelve-point alternatives, a critical advantage during installation and any future service work.

ARP's chromoly material construction offers measurably higher tensile strength than standard steel, enabling consistent torque retention under the thermal cycling and pressure cycles inherent to high-output engine operation. The black oxide finish provides corrosion resistance in engine bay conditions while maintaining the dimensional precision required for proper head gasket sealing. This kit is compatible with both OEM cylinder heads and Edelbrock aftermarket heads, making it suitable for restoration work, performance builds, and engine rebuilds across multiple vintage and contemporary big block Ford configurations.

Buyers performing engine work on big block Ford platforms—whether classic muscle car restoration, street performance, or marine engine service—require fasteners that maintain clamp load across extended operation. The ARP specification delivers the material grade and design geometry that prevent head lift, gasket failure, and the catastrophic coolant loss that results from inadequate fastener selection. The six-point hex configuration is standard for serious engine builders who prioritize installation accuracy and long-term reliability.

Specification and compatibility details are provided in the table below. Proper installation torque procedures and sequence should be followed per ARP documentation and your engine manual for optimal head sealing and fastener performance.