SKU: 1023
GSC P-D Subaru FA20 Viton 5.5mm Valve Stem Seal Set 2013-2021 BRZ STI FR-S 86
GSC Power-Division Viton valve stem seals fit Subaru FA20 engines in BRZ STI FR-S and 86 models providing exact 5.5mm stem sealing to control oil flow. These seals prevent oil from entering the combustion chamber supporting consistent power and reduced smoke during high-rev operation. Ideal for rebuilds or upgrades in performance Subaru FA20 applications.
Key Features
- Viton Material: Fluorocarbon rubber withstands 400°F temperatures and resists fuels oils for extended service life in boosted or track engines
- 5.5mm Stem Fit: Matches OEM FA20 valve dimensions for drop-in installation with zero clearance issues
- Positive Seal Design: Twin-lip configuration meters oil precisely minimizing consumption and deposits on valves
- Complete 16-Piece Set: Includes seals for all 16 valves (8 intake 8 exhaust) covering full DOHC FA20 cylinder head
- High-Pressure Durability: Maintains seal integrity under 50psi crankcase pressure common in modified FA20 setups
Product Notes
- Replace seals during every cylinder head removal for best results
- Inspect valve guides for wear before installation
- Standard ground shipping in protective packaging
Installation Notes
- Professional installation recommended.
- Remove valve springs and retainers to access stems
- Use GSC seal driver tool or equivalent for even press-fit without damage
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2013-2016 | Scion | FR-S | All |
| 2013-2020 | Subaru | BRZ | All |
| 2015-2021 | Subaru | WRX STI | All |
| 2017-2020 | Toyota | 86 | All |
Why Choose GSC Power-Division?
- Motorsport-proven components used in championship-winning Subaru engines
- USA-made with tight tolerances for repeatable performance
- Direct engineering input from FA20 race teams for real-world reliability
Frequently Asked Questions
- Q: Will this fit 2015-2021 Subaru STI FA20F turbo engines?
A: Yes fits all 2015-2021 WRX STI models with FA20F 5.5mm valve stems including boosted applications - Q: What makes Viton better than stock seals?
A: Viton handles higher heat and oil contamination without swelling or hardening extending seal life in performance FA20 builds - Q: Is special hardware needed for installation?
A: Standard valve spring compressor and seal driver suffice no custom parts required compatible with OEM heads
Shipping & Handling
- Method: Standard Ground
- Availability: In stock – ships same or next business day
- Packaging: Compact box 1 x 5.75 x 7.75 inches
- Weight: 0.13 lbs
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