GSC Power Division Exhaust Valve Guide

2013–2020 Subaru BRZ / 2013–2016 Scion FR-S / 2017–2020 Toyota 86

3105.003-1

Overview:

The GSC Power Division Exhaust Valve Guide with a +.003 inch oversize stopper is a precision-engineered replacement part designed specifically for the Subaru FA20 engine found in the Subaru BRZ, Toyota 86, and Scion FR-S models within the specified year ranges. This single valve guide upgrade is ideal for enthusiasts and professional builders who seek enhanced durability and reliability in their engine’s valvetrain components.

Whether you are rebuilding your engine or upgrading for improved performance and longevity, this valve guide helps maintain optimal valve alignment and sealing under increased stress conditions. It is especially suited for those running higher boost levels, aggressive cam profiles, or extended track use where factory valve guides may wear prematurely.

Key Features:

This exhaust valve guide offers several technical advantages that support improved engine performance and reliability:

• +.003 inch oversize stopper design ensures a precise fit and enhanced valve stem support.
• Manufactured by GSC Power Division, a trusted brand known for high-quality valvetrain components.
• Constructed from durable materials engineered to withstand high temperatures and prolonged use.
• Designed specifically for the Subaru FA20 engine platform, ensuring perfect compatibility and fitment.
• Improves valve guide sealing and reduces valve stem wear compared to OEM components.
• Supports increased valve control under high RPM and performance driving conditions.
• Ideal for performance builds, track cars, and enthusiasts seeking reliable valvetrain upgrades.

Construction & Design:

The GSC exhaust valve guide is precision-machined to tight tolerances, ensuring consistent valve stem alignment and smooth valve operation. The +.003 inch oversize stopper provides a slightly larger diameter than stock guides, which helps maintain proper valve stem clearance and reduces the risk of valve wobble or excessive wear. This design choice enhances the durability of the valvetrain, particularly under high-stress conditions such as forced induction or aggressive camshaft profiles.

GSC Power Division utilizes high-grade materials and manufacturing processes to deliver a component that withstands the demanding thermal and mechanical environment of the exhaust port. This valve guide upgrade integrates seamlessly with OEM valve stems and seats, allowing for straightforward installation without compromising engine reliability.

Installation & Fitment:

This valve guide is a direct fit replacement for the exhaust valve guides on the Subaru FA20 engine used in the Subaru BRZ (2013–2020), Toyota 86 (2017–2020), and Scion FR-S (2013–2016). Installation typically requires professional machining tools and expertise to remove the old guides and install the new oversize guides correctly.

No modifications to the cylinder head or valve stems are necessary beyond standard machining procedures. This part is intended for engine rebuilds or performance upgrades where valve guide wear or clearance issues are a concern.

• Direct replacement for factory exhaust valve guides on specified models.
• Requires professional installation with proper machining equipment.
• No cutting, drilling, or special tuning of the engine management system is required.

What's Included:

• Single GSC Power Division +.003 inch oversize stopper exhaust valve guide

Ideal For:

This valve guide is perfect for:

• Engine builders and mechanics performing Subaru FA20 engine rebuilds.
• Performance enthusiasts upgrading their valvetrain for improved durability.
• Track and race car owners who demand reliable valve control under high RPM.
• Owners of Subaru BRZ, Toyota 86, and Scion FR-S models looking to extend engine life.

GSC Power Division specializes in high-performance camshafts and valvetrain components for import engines, including Subaru, Mitsubishi, Toyota, and Nissan models. Their products are designed to enhance engine performance in both street and race applications, offering improved mid-range and top-end power without sacrificing low-end torque.