ARP Head Stud Kit

2007–2010 Scion tC / 2008–2015 Scion xB2 2.4L 2AZFE Engine

203-4306

Overview:

The ARP 2AZFE Head Stud Kit is a premium upgrade designed specifically for the second-generation 2.4L 2AZFE engines found in the 2007–2010 Scion tC and 2008–2015 Scion xB2 models. This kit replaces the factory head bolts with high-strength ARP2000 studs, providing superior clamping force and durability. Ideal for enthusiasts seeking enhanced engine reliability and performance, these head studs help maintain a consistent head gasket seal under increased stress, making them perfect for both street and mild performance applications.

By upgrading to ARP head studs, you reduce the risk of head gasket failure caused by cylinder head movement or warping, especially under higher boost or increased power levels. This kit ensures precise alignment and a secure fit, improving engine longevity and peace of mind.

Key Features:

Engineered for strength and precision, the ARP 2AZFE Head Stud Kit offers the following benefits:

• Constructed from premium grade 8740 chromoly alloy, exceeding aircraft quality standards
• Heat-treated to an impressive tensile strength of 220,000 psi for maximum durability
• Centerless ground for exceptional straightness and perfect concentricity
• Thread rolled after heat treatment to increase fatigue strength by approximately 1000%
• Designed specifically for Gen 2 2AZFE engines, with correct stud lengths for 2007–2015 models
• Ensures precise cylinder head alignment and gasket seating for improved sealing
• Ideal for high-performance builds, forced induction setups, and increased engine stress
• Corrosion-resistant finish for long-lasting reliability

Construction & Design:

ARP utilizes a premium 8740 chromoly alloy for these head studs, a material known for its exceptional strength and toughness. This alloy surpasses typical aircraft-grade fasteners, providing a robust foundation for demanding engine environments. Each stud undergoes a rigorous heat treatment process to achieve a tensile strength of 220,000 psi, ensuring they can withstand extreme clamping forces without stretching or failing.

Following heat treatment, the studs are centerless ground through multiple precise cuts to achieve near-perfect straightness and concentricity. This meticulous manufacturing process guarantees that the studs allow the cylinder head and gasket to slide into place smoothly, reducing installation difficulty and improving overall engine sealing. The threads are rolled after heat treatment, significantly enhancing fatigue resistance compared to studs threaded before heat treatment.

Installation & Fitment:

The ARP 2AZFE Head Stud Kit is a direct fit replacement for the factory head bolts on 2007–2010 Scion tC and 2008–2015 Scion xB2 models equipped with the 2.4L 2AZFE Gen 2 engine. Installation requires standard head removal procedures and can be performed by experienced enthusiasts or professional mechanics. No modifications to the cylinder head or block are necessary, but proper torque specifications and installation sequence should be followed to ensure optimal performance and reliability.

What's Included:

• Complete set of ARP2000 head studs for Gen 2 2AZFE engines
• High-quality nuts compatible with the studs
• Installation instructions and torque specifications

Ideal For:

This head stud kit is ideal for Scion tC and xB2 owners looking to upgrade their engine’s durability and reliability, especially those planning performance modifications such as forced induction or higher RPM operation. It is also well-suited for daily drivers seeking peace of mind through improved engine sealing and longevity.