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GSC Power-Division made in USA performance valve train components
Close up GSC billet chromoly cam lobe profile and journal
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GSC P-D Subaru EJ257 w/Dual AVCS S1 Cams 266/264 Billet

GSC7026S1
GSC7026S1
Camshafts
Out of stock
$ 1,245.50 $ 1,058.68

SKU: 7026S1

GSC Power-Division S1 Billet Camshafts 2008-2021 Subaru WRX STI EJ257 w/ Dual AVCS 266/264

The GSC 7026S1 is the number one selling street performance billet camshaft set for Dual AVCS EJ257 engines in 2008-2021 WRX STI. These cams deliver 266° intake and 264° exhaust duration with 10.20mm intake and 9.85mm exhaust lift for crisp throttle response, strong mid-range power, and 30-50 whp gains with supporting modifications. Precision-ground from billet chromoly, they provide quick turbo spool and a broad powerband for daily driving and track use.

Key Features

  • Billet Chromoly Construction: CNC-ground from solid bar stock for maximum strength, durability, and exact tolerances
  • S1 Street/Strip Profile: Designed for fast spool-up, wide power delivery, and smooth drivability on street or track
  • High Lift and Duration: 10.20mm intake and 9.85mm exhaust lift with 266°/264° @ 0.050" for improved airflow and valve timing
  • Power Gains: Adds 30-50 whp with tune, exhaust, and intake mods while maintaining reliability
  • USA Made: Engineered and manufactured in the USA with limited lifetime warranty

Product Notes

  • Fits 2008-2021 Subaru WRX STI with Dual AVCS EJ257 engines only, not compatible with single AVCS or EJ255
  • Valve spring upgrade recommended for RPM over 7500, works with stock springs at lower revs
  • Part number 7026S1, core not required

Installation Notes

  • Professional installation recommended.
  • Installation time 8-12 hours, requires full timing belt service and degreeing
  • ECU tune required for proper AVCS mapping and performance

This Part Fits

Year Make Model Submodel
2008-2021 Subaru WRX STI

Why Choose GSC Power-Division?

  • Industry leader in high-performance Subaru valve train components
  • Used by top time attack, drag, and rally teams worldwide
  • Precision engineered and manufactured in the USA

Frequently Asked Questions

  • Q: Will these cams fit 2008-2021 WRX STI EJ257?
    A: Yes, designed exclusively for Dual AVCS EJ257 in USDM 2008-2021 WRX STI, not EJ255 or single AVCS.
  • Q: What material are the camshafts?
    A: Billet chromoly, CNC-ground from solid bar for strength and precision lobe profiles.
  • Q: What is the warranty and install needs?
    A: Limited lifetime warranty. Pro install, timing belt service, and ECU tune required.

Shipping & Handling

  • Method: UPS/FedEx Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Official GSC Power-Division retail box
  • Weight: 12 lbs
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