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GSC P-D Subaru FA20 Viton 6mm Valve Stem Seal - Set of 500 GSC Power Division
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GSC P-D Subaru FA20 Viton 6mm Valve Stem Seal - Set of 500

GSCB1023
GSCB1023
Valve Seals
Out of stock
$ 434.47 $ 369.30

SKU: B1023

GSC P-D Subaru FA20 Viton 5.5mm Valve Stem Seal - Set of 500 for 2015-2021 WRX STI

GSC Power-Division Viton valve stem seals fit Subaru FA20F engines in 2015-2021 WRX STI models. These seals meter oil precisely to intake and exhaust valves reducing consumption and maintaining valvetrain lubrication during high-rpm operation. The bulk set of 500 supports race teams shops and builders tackling multiple FA20 engine refreshes.

Key Features

  • Viton Construction: Resists temperatures up to 400°F prevents hardening and cracking for long-term sealing in boosted FA20 applications
  • 5.5mm Low Stem Design: Matches OEM Subaru FA20 valve stems for drop-in fit without guide wear or oil bypass issues
  • Bulk Set of 500: Provides enough seals for 31 complete FA20 engines ideal for professional rebuilds and high-volume service
  • Precision Molded Seals: Ensures uniform tension and zero leaks supporting consistent power delivery in track and street use
  • High-Durability Material: Outperforms stock rubber seals in oil resistance and heat cycling for sustained valvetrain performance

Product Notes

  • Inspect valve guides for wear before installation to achieve full sealing performance
  • Store seals in original packaging away from contaminants and direct sunlight
  • Packaged in protective bulk container to prevent damage during transit

Installation Notes

  • Professional installation recommended.
  • Use a valve seal driver tool sized for 5.5mm stems to seat seals evenly without distortion
  • Compatible with stock or aftermarket valve guides clean thoroughly with solvent prior to assembly

This Part Fits

Year Make Model Submodel
2015-2021 Subaru Impreza WRX STI
2015-2021 Subaru WRX STI

Why Choose GSC Power-Division?

  • Proven in professional motorsports with championship-winning Subaru teams
  • Manufactured in USA with rigorous quality controls for consistent results
  • Engineered specifically for high-boost FA applications like the STI FA20F

Frequently Asked Questions

  • Q: Will these seals fit 2015-2021 Subaru WRX STI FA20 engines?
    A: Yes designed exclusively for FA20F engines in all 2015-2021 STI models including USDM JDM and Euro variants with 5.5mm valve stems
  • Q: What makes Viton better than stock seals?
    A: Viton handles extreme heat oil additives and boost pressure far longer than OEM rubber reducing smoke and oil burn over thousands of miles
  • Q: What is the warranty on these seals?
    A: GSC offers a limited lifetime warranty against manufacturing defects when installed by certified technicians

Shipping & Handling

  • Method: UPS Ground or USPS Priority
  • Availability: In stock - ships same or next business day
  • Packaging: Secure bulk box 6 x 4 x 4 inches
  • Weight: 0.7 lbs

Request For Information

Have questions about GSC P-D Subaru FA20 Viton 6mm Valve Stem Seal - Set of 500? Fill out the form below and we'll get back to you by the next business day.
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