What material are these head bolts made from?

These head bolts are made from 8740 chromoly steel. This material is known for its strength and ability to withstand the high stresses found in an engine's cylinder head assembly.

Are these bolts suitable for all Pontiac V8 engines?

This specific kit, part number 190-3602, is designed for 1965-1966 Pontiac V8 engines with displacements ranging from 326 to 421 cubic inches, and specifically for D-port cylinder heads.

What is the benefit of using ARP head bolts over stock bolts?

ARP head bolts are made from a stronger material (8740 chromoly steel) and are manufactured to tighter tolerances. This results in improved tensile strength and more consistent clamping force, which is crucial for maintaining a proper seal between the cylinder head and the engine block.

ARP Pontiac Head Bolt Kit 190-3602

Name: ARP Pontiac 1965-66 326-421 cid w/ D-Port Head Bolt Kit
Brand: ARP
SKU: arp-arp-pontiac-1965-66-326-421-cid-w-d-port-head-bolt-kit-t14-251147
Price: 98.65 USD
Availability: BackOrder

ARP Pontiac 1965-66 326-421 cid w/ D-Port Head Bolt Kit

$98.65

On Backorder

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

ARP Pontiac 1965-66 326-421 cid w/ D-Port Head Bolt Kit. These bolts offer improved clamping force for your Pontiac V8.

Key Features

Fits 1965-1966 Pontiac 326-421 cid V8 engines with D-Port cylinder heads.
Constructed from strong 8740 chromoly steel for improved tensile strength.
Designed to provide consistent and reliable clamping force for a solid cylinder head seal.
Manufactured to tight tolerances for a proper fit.

⚠️ 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 190-3602 head bolt kit uses 8740 chromoly steel, a strong material chosen for its ability to handle the stresses of engine operation. This kit is specifically for Pontiac V8 engines from 1965 and 1966, covering displacements from 326 to 421 cubic inches, and is designed for D-port cylinder heads. When you're rebuilding the top end of your Pontiac, ensuring a solid seal between the cylinder head and the engine block is critical for performance and longevity. These bolts are designed to provide consistent and reliable clamping force, helping to prevent leaks and maintain proper compression.

The 8740 chromoly steel construction means these bolts offer improved tensile strength compared to standard factory bolts. This is important because the cylinder head bolts are under significant tension as the engine heats up and cools down. ARP has a reputation for well-built engine components, and this kit is no exception. They are manufactured to tight tolerances to ensure they fit right and perform as expected in your Pontiac V8.