What material are these head bolts made from?

These head bolts are manufactured from ARP's proprietary 8740 chromoly steel. This material is heat-treated to achieve a tensile strength of 200,000 psi, ensuring they are strong enough for demanding engine applications.

Why do these bolts have 12-point heads?

The 12-point heads are designed to offer better access for your socket wrench, especially in tight engine compartments. This can make the installation process more straightforward compared to traditional 6-point fasteners.

What is the purpose of the included washers?

The kit comes with hardened parallel ground washers. These are important for distributing the clamping load evenly across the cylinder head surface, which helps prevent damage and ensures consistent sealing.

ARP SB Chevy 12pt Head Bolt Kit 134-3701

Name: ARP SB Chevy 12pt head bolt kit
Brand: ARP
Price: 102.23 USD
Availability: InStock

ARP SB Chevy 12pt head bolt kit

$102.23

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

ARP SB Chevy 12pt head bolt kit.

Key Features

ARP 12-point head bolt kit for SB Chevy engines.
Made from ARP's 8740 chromoly steel.
Heat-treated to 200,000 psi tensile strength.
Features 12-point heads for easier tool access.
Includes hardened parallel ground washers for even load distribution.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

ARP is well-known for making strong fasteners, and this 12-point head bolt kit for Small Block Chevy engines is a prime example of their work. When you're rebuilding the top end of your engine, using reliable head bolts is crucial for ensuring a proper seal between your cylinder heads and the engine block. These bolts are designed to handle the pressures and temperatures found in performance applications.

This kit features 12-point heads, which can be easier to access in tight engine bays compared to traditional 6-point fasteners. They are made from ARP's proprietary 8740 chromoly steel, heat-treated to 200,000 psi tensile strength, giving you confidence in their ability to hold your heads down securely under demanding conditions. The kit includes hardened parallel ground washers for even load distribution, which is important for preventing damage to the cylinder head deck.

For proper installation, it's recommended to use ARP Ultra-Torque Fastener Lubricant (sold separately) and follow the manufacturer's torque-to-yield specifications. This ensures the bolts stretch correctly to achieve the desired clamping force without over-stressing the material.