What material are these head bolts made from?

These head bolts are made from 8740 chromoly steel. This material is heat-treated to achieve a tensile strength of 200,000 psi, making them very strong for engine applications.

Are the washers included with this head bolt kit?

Yes, this kit includes parallel ground washers. These washers help to ensure that the load is distributed evenly across the bolt head and the cylinder head surface.

What is the advantage of rolled threads over cut threads?

Rolled threads are stronger than cut threads because the material is displaced rather than removed. This process also makes the threads smoother and less prone to cross-threading during installation.

ARP SB Chevy 18A Hi-Port Head Bolt Kit 234-3708

Name: ARP SB Chevy 18A hi-port head bolt kit
Brand: ARP
SKU: arp-arp-sb-chevy-18a-hi-port-head-bolt-kit-t14-854140
Price: 272.03 USD
Availability: BackOrder

ARP SB Chevy 18A hi-port head bolt kit

$272.03

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 18A hi-port head bolt kit. Strong, well-built bolts for your small block Chevy.

Key Features

Fits Small Block Chevy engines with hi-port cylinder heads.
Constructed from 8740 chromoly steel with a tensile strength of 200,000 psi.
Features precisely rolled threads for improved strength and ease of installation.
Includes parallel ground washers for uniform load distribution.
Designed for consistent and reliable clamping force.
ARP is a well-known brand for engine fasteners.

⚠️ 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's 18A hi-port head bolt kit uses a robust 8740 chromoly steel construction, heat-treated to 200,000 psi tensile strength. This ensures these bolts can handle the increased clamping forces needed for high-performance small block Chevy engines, especially those with hi-port cylinder heads. The kit is designed to provide a more consistent and reliable seal between the cylinder head and the engine block compared to standard bolts.

Each bolt in this kit features a precisely rolled thread, which is stronger and easier to install than cut threads. They also come with parallel ground washers that ensure uniform load distribution across the bolt head, preventing damage to the cylinder head surface. This attention to detail in materials and design means you get a well-built component that contributes to the overall integrity of your engine build.

When rebuilding or upgrading your small block Chevy's top end, using a quality head bolt kit like this ARP 234-3708 is a smart move. It's a popular choice for builders who want peace of mind knowing their cylinder heads are securely fastened, allowing the engine to perform reliably under demanding conditions.