Brian Crower Valve Springs with Retainers

2004–2006 Scion xA / xB 1.5L 1NZ-FE Engine

BC0330

Overview:

The Brian Crower Valve Springs with Retainers kit is engineered specifically for the 2004 to 2006 Scion xA and xB models equipped with the 1.5L 1NZ-FE engine. Designed to support high RPM operation, this valve spring kit is ideal for enthusiasts seeking enhanced valvetrain stability and performance under demanding conditions. Whether upgrading for spirited street driving or track use, these springs provide consistent pressure and durability to help maximize engine efficiency and reliability.

Brian Crower’s expertise in valvetrain components ensures that these valve springs and titanium retainers deliver precise control over valve motion, reducing the risk of valve float and improving throttle response. This kit is a perfect complement to performance camshafts and other engine upgrades.

Key Features:

Brian Crower valve springs are crafted with meticulous attention to detail, incorporating advanced materials and manufacturing techniques to meet the needs of high-performance applications. Key features include:

• Wound from premium chrome silicon alloy for superior strength and fatigue resistance
• Consistent spring pressures achieved through proprietary processing methods
• CNC machined 6AL4V titanium retainers for lightweight durability and precise fitment
• Designed to handle high RPM limits without valve float or coil bind
• Complete kit includes valve springs, titanium retainers, and seat kit for a full upgrade
• Spring pressure specifications: 82 lbs at 1.300" seat height, 188 lbs at 0.900" open height
• Coil bind at 0.810" with no machine work required for installation
• Recommended for use with Brian Crower camshafts (sold separately) for optimal performance

Construction & Design:

The valve springs are manufactured from the highest grade, super clean chrome silicon alloy, known for its excellent fatigue life and resistance to heat and stress. This material choice ensures the springs maintain consistent pressure throughout their service life, even under the rigors of high RPM operation.

The titanium retainers are precision CNC machined from 6AL4V round bar titanium, a material prized for its exceptional strength-to-weight ratio. This reduces valvetrain mass, allowing for quicker valve response and improved engine efficiency. The exacting tolerances of the retainers ensure a secure fit and reliable performance without the need for additional modifications.

Installation & Fitment:

Installation of the Brian Crower Valve Springs with Retainers kit is straightforward and designed to fit the stock cylinder head of the 2004–2006 Scion xA and xB with the 1NZ-FE 1.5L engine. No machine work is required due to the carefully engineered coil bind clearance. This makes the upgrade accessible to experienced enthusiasts and professional installers alike.

For best results, it is recommended to pair these valve springs with compatible performance camshafts, such as those offered by Brian Crower, to fully capitalize on the enhanced valvetrain capabilities.

What's Included:

• Set of Brian Crower Valve Springs
• CNC Machined Titanium Retainers
• Seat Kit for proper installation

Ideal For:

This valve spring and retainer kit is ideal for Scion xA and xB owners looking to upgrade their engine’s valvetrain for higher RPM performance, improved reliability, and enhanced throttle response. It suits enthusiasts who are installing performance camshafts or building engines for street performance, autocross, or track use. The kit offers a durable and precise solution for maintaining valve control under demanding conditions without extensive modifications.

Brian Crower (BC) supplies performance engine internals and valvetrain components aimed at serious builds, including stroker kits and rotating assemblies. Known for system-matched parts designed to work together, BC products are a go-to for enthusiasts chasing more displacement, higher RPM capability, and stronger bottom-end reliability in high-output street or track applications.