GSC Power-Division Traditional Exhaust Valve Guide – Subaru EJ20/EJ25

GSC Power-Division Traditional Exhaust Valve Guide – Subaru EJ20/25 Series (Part # GSC3027)

The GSC Power-Division GSC3027 Traditional Exhaust Valve Guide is a precision-machined upgrade for Subaru EJ20 and EJ25 engines, including EJ205, EJ207, EJ255, EJ257, and EJ257B variants. Designed in a smooth-style finish, these valve guides ensure long-term reliability and stable valve operation in high-performance or rebuilt heads.

GSC’s valve guides are made from premium materials with tight tolerances for improved oil control, reduced valve wobble, and extended durability—particularly under the high loads and heat common in boosted Subaru applications.

Key Features

• Traditional smooth-style exhaust valve guide design
• Suitable for both OEM replacement and performance builds
• Available in standard size and oversized variants (+0.001", +0.003")
• Precision-machined for consistent fitment and durability
• Ideal for EJ205, EJ207, EJ255, EJ257, and EJ257B cylinder heads

Technical Specifications

Vehicle Compatibility

• Subaru WRX – EJ205 / EJ207
• Subaru WRX STI – EJ255 / EJ257 / EJ257B
• Subaru Forester XT / Liberty GT – EJ Turbo Platforms

Note: Oversized guides are sold individually and are available in +0.001" and +0.003" sizing. Always measure cylinder head bores before ordering oversized variants.