ARP SB Chevy 18A head bolt kit

These ARP head bolts are made from ARP's proprietary 8740 chromoly steel, a well-known material for its strength and durability in high-stress engine applications. This specific kit is designed for Small Block Chevrolet 18 Degree cylinder heads, often found in performance-oriented builds where improved airflow and combustion efficiency are key. Using high-strength head bolts like these helps ensure a consistent clamping force across the cylinder head deck, which is critical for maintaining a proper seal and preventing leaks under high combustion pressures.

ARP has a solid reputation for producing reliable engine fasteners, and this kit is no exception. The bolts feature a rolled thread, which is stronger than cut threads and helps prevent galling during installation. They also come with parallel ground washers that ensure even load distribution, preventing distortion of the cylinder head deck. This attention to detail in manufacturing makes them a popular choice for engine builders looking for dependable components for their Small Block Chevy builds.

When installing these head bolts, it's important to follow ARP's recommended torque-to-yield procedure, which is detailed in the included instructions. This ensures the bolts are stretched to their optimal length for maximum clamping force without over-stressing the material. Using a quality assembly lubricant is also recommended to achieve accurate torque readings and prevent seizing.