GSC 3105-8 Stopper Style Exhaust Valve Guide Set for Subaru FA20/BRZ

Vehicle Fitment

• 2015-2021 Subaru WRX (FA20F)
• 2013-2020 Subaru BRZ (FA20)
• 2013-2020 Scion FR-S / Toyota 86 (FA20, shared platform)

Fitment Notes

• Exhaust valve guides - stopper style, sold as a complete set of 8
• Standard size
• Total length: 1.456" (36.98mm)
• Guides conduct heat from the exhaust valve into the cylinder head - critical for maintaining valve temperature control

Features

• Stopper-style design provides a precise, consistent installation depth for accurate valvetrain geometry
• Precision-manufactured on dedicated CNC machining centers to exacting tolerances
• Designed using advanced FEA and flow simulation software for real-world performance validation
• Improves valvetrain stability and longevity under high-RPM, high-heat operation
• Purpose-built for the FA20 platform's specific exhaust valve guide requirements

Specifications

• Type: Stopper Style Exhaust Valve Guide Set
• Total Length: 1.456" (36.98mm)
• Size: Standard
• Quantity: Set of 8
• Engine: Subaru FA20 / FA20F

Included Components

• 8x Exhaust Valve Guides

Product Description

The GSC 3105-8 stopper-style exhaust valve guide set replaces the factory guides on the FA20 platform with a design engineered specifically for consistent, accurate installation depth - a critical detail for maintaining proper valvetrain geometry across the WRX, BRZ, FR-S, and 86. Precision manufacturing on GSC's CNC machining centers ensures each guide holds tight tolerances for reliable heat transfer and valve control.

For FA20 owners doing a head rebuild or upgrading valvetrain components to support increased boost or higher RPM operation, these guides provide a proven, application-specific improvement over factory material. As part of a complete valvetrain refresh alongside GSC's matching valves, springs, and retainers, this guide set helps ensure long-term reliability under demanding performance conditions.