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SKU: B3025
GSC P-D Subaru EJ205/EJ207/EJ257 Manganese Bronze Exhaust Valve Guide Stopper Style - Set of 240 (1998-2021 Impreza WRX/STI)
GSC Power-Division manganese bronze exhaust valve guides in stopper style come as a set of 240 for Subaru EJ205 EJ207 and EJ257 engines in Impreza WRX and STI models. These guides provide exact fitment with secure valve stem seal retention under extreme heat and rpm. Engine builders rely on them for consistent valve motion in turbocharged applications.
Key Features
- Manganese Bronze Material: Delivers wear resistance and thermal conductivity to handle exhaust side temperatures in EJ turbo engines
- Stopper Style Design: Locks valve seals in position to prevent blow-by and maintain compression during high boost runs
- Precision Dimensions: Guide OD 14.000mm ID 8.035mm length 46.00mm for drop-in compatibility with stock or ported heads
- Bulk Set of 240: Supplies 30 full engine sets of 8 exhaust guides ideal for race shops or multiple rebuilds
- High Volume Manufacturing: Ensures consistent quality with interference fit for press installation
Product Notes
- Guides require honing to 8.050-8.055mm finished bore after installation
- Pair with GSC intake guides B3024 for complete valvetrain refresh
- Packaged securely to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Use valve guide press tool and freeze plug method for controlled insertion depth
- Compatible with stock heads bronze seats and oversized valves up to 1.500in
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX |
| 2004-2021 | Subaru | Impreza | WRX STI |
| 1998-2001 | Subaru | Impreza | WRX STI (JDM GC8 EJ207) |
| 2001-2007 | Subaru | Impreza | WRX STI (JDM GDB EJ207) |
Why Choose GSC Power-Division?
- Proven in WRX STI drag and rally engines worldwide
- Focus on direct-fit valvetrain parts for Subaru turbo platforms
- Engineered tolerances reduce guide wear and valve chatter
Frequently Asked Questions
-
Q: Which Subaru engines use these exhaust guides?
A: Designed specifically for EJ205 EJ207 EJ257 exhaust positions in USDM and JDM Impreza WRX STI heads -
Q: Why manganese bronze over cast iron?
A: Bronze withstands higher exhaust temperatures with better lubrication retention and less galling on chrome valves -
Q: What tools are needed for install?
A: Valve guide driver kit head freezer and Serdi-style hone for post-install finish
Shipping & Handling
- Method: UPS Ground / USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Protective plastic tray in 8 x 6 x 2 inch box
- Weight: 0.75 lbs
GSC Power Division
GSC Power Division is a manufacturer of precision-engineered camshafts, valve springs, and valvetrain components designed for high-performance and competition engines across domestic, import, and diesel platforms. Founded by engineers with deep roots in motorsport, GSC Power Division components are machined to exacting tolerances and heat-treated to survive the demands of forced induction and high-rpm applications that destroy stock valvetrain parts. The brand is particularly well-known in the Mitsubishi Evo, Subaru STI, Nissan RB, and Toyota 2JZ communities where aggressive camshaft profiles are essential for extracting maximum power from turbocharged four-cylinder and six-cylinder engines. Whether building for drag racing, road course competition, or a high-powered street car, GSC Power Division camshafts and valve springs are a proven upgrade path. Popular Upgrades GSC Power Division S1, S2, and S3 camshafts are the most popular selections, with each profile offering progressivel...
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