ARP Head Stud Kit

2005–2006 Scion tC 2AZ-FE Engine

203-4303

Overview:

The ARP 2AZFE Head Stud Kit is a premium upgrade designed specifically for the first-generation Scion tC models from 2005 to 2006 equipped with the 2AZ-FE engine. This kit replaces the factory head bolts with high-strength ARP2000 head studs, providing superior clamping force and reliability under high-performance and high-stress conditions. Ideal for enthusiasts looking to enhance engine durability, prevent head gasket failures, and support increased power output, this kit ensures a more secure and consistent cylinder head seal.

Manufactured by ARP, a leader in fastener technology, these head studs are engineered to exacting standards to deliver exceptional strength and precision fitment, making them a trusted choice for both street and track applications.

Key Features:

The ARP 2AZFE Head Stud Kit offers advanced engineering and materials that set it apart from standard OEM fasteners:

• 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 concentricity, ensuring perfect alignment
• Thread rolled after heat treatment to increase fatigue strength by approximately 1000%
• Precision manufacturing tolerances allow cylinder heads and gaskets to glide into position effortlessly
• Designed specifically for the 2AZ-FE engine in 2005–2006 Scion tC models for guaranteed fitment
• Improves clamping force consistency to reduce the risk of head gasket leaks under high boost or high RPM conditions
• Corrosion-resistant finish for long-lasting performance

Construction & Design:

Each ARP head stud is crafted from 8740 chromoly alloy, a high-strength steel alloy known for its toughness and resistance to stretching under extreme loads. The studs undergo a rigorous heat treatment process to achieve a tensile strength of 220,000 psi, which is significantly higher than typical OEM fasteners. This heat treatment ensures complete heat penetration for uniform strength throughout the stud.

Following heat treatment, the studs are centerless ground through multiple precise cuts to achieve near-perfect straightness and concentricity. This meticulous process guarantees that the studs align perfectly with the cylinder head and gasket, facilitating easier installation and superior sealing. Additionally, the threads are rolled after heat treatment, dramatically increasing fatigue resistance and longevity 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 2005 and 2006 Scion tC models equipped with the 2AZ-FE engine. Installation requires standard head removal procedures and can be performed by experienced DIYers or professional mechanics. No modifications to the engine block or cylinder head are necessary, making this an efficient upgrade for improving engine reliability and performance potential.

Due to the precise manufacturing tolerances, the studs allow the cylinder head and gasket to slide into place smoothly, reducing installation time and minimizing the risk of gasket damage.

What's Included:

• Complete set of ARP2000 head studs for the 2AZ-FE engine
• Matching nuts and washers engineered for optimal clamping force
• Installation instructions and torque specifications

Ideal For:

This head stud kit is ideal for Scion tC owners who are upgrading their engine for increased power, running forced induction setups, or seeking enhanced engine durability for spirited driving and track use. It is also a recommended upgrade for anyone performing a head gasket replacement or engine rebuild on the 2005–2006 2AZ-FE engine to ensure long-term reliability.