ARP Head Bolt Kit 134-3609 — High-Strength Alloy Steel Fasteners, Corrosion-Resistant Finish

This ARP head bolt kit is a precision-made collection of fasteners intended to secure the cylinder head to the engine block. ARP has a long history of designing specialty hardware for road and race use, and this kit follows that lineage by delivering controlled stretch, consistent torque retention, and compatibility with the specified engine family. The components are manufactured and finished to resist corrosion and maintain clamping force across many heat and load cycles.

What materials and construction are used in the ARP 134-3609 Head Bolt Kit?

The bolts in this kit are produced from high-strength alloy steel chosen for predictable yield and tensile properties under engine loads. Each fastener is heat-treated and machined to tight tolerances so stretch characteristics are repeatable during installation. The kit typically includes washers or specified hardware to ensure proper seating of the bolt head.

• High-strength alloy steel with controlled heat treatment
• Precision machining for consistent thread engagement
• Protective finish to reduce corrosion and galling
• Includes any required washers or specialty pieces per part number

How does this head bolt kit affect engine assembly and torque accuracy?

Using properly specified head bolts reduces variation in clamp load after tightening, which helps maintain head gasket sealing and uniform cylinder pressures. ARP fasteners are engineered for consistent stretch so torque-angle or torque-to-yield procedures produce predictable results. That makes achieving manufacturer or performance-spec clamping forces more repeatable across multiple rebuilds.

• Designed for uniform elastic stretch to improve torque accuracy
• Reduces need for frequent re-torquing compared with inconsistent fasteners
• Compatible with torque-angle and torque-plus-angle assembly methods
• Helps maintain head gasket sealing under thermal cycling

Which applications and conditions is the ARP 134-3609 Head Bolt Kit suited for?

This kit covers engines within the original part-number fitment and is intended for both street-driven and high-performance use where stronger head clamping is desired. It is appropriate for rebuilds, performance upgrades, or OEM-equivalent replacements whenever the part number matches the engine. Installation should follow the engine manufacturer's specified tightening sequence and torque procedure.

• OEM-replacement for compatible engine families
• Street, track, and light-duty racing environments
• Suitable for rebuilds and performance builds when specified
• Must be installed using manufacturer torque sequence and specs

What should technicians know before installing these head bolts?

Before installation, inspect the block and head threads for damage and clean oil or debris from sealing surfaces. Use the recommended lubricant or ARP-specified assembly oil on threads if required, and follow the stepwise torque or angle method to achieve correct clamp load. Replace any fastener that shows damage or exceeds recommended reuse limits.

• Clean and inspect mating threads and surfaces
• Apply the specified lube to threads if required by ARP instructions
• Follow step-torque or torque-angle sequence for consistent stretch
• Do not reuse bolts beyond ARP guidance or visible damage

Who is this for: The ARP 134-3609 Head Bolt Kit is aimed at professional mechanics, performance builders, and DIY enthusiasts who need dependable, high-strength head fasteners for compatible engines. If you prioritize consistent torque behavior, improved clamp reliability, and hardware manufactured to precise tolerances for street or performance use, this kit addresses those needs—provided you install it using the engine maker’s specified procedures.

Features:

• Get the best with ARP
• When you want strong, go with ARP
• Precision products for street, offroad, and Powersports applications