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The GSC Power Division Subaru EJ257 w/Dual AVCS S1 Cams 266/264 Billet is a camshafts for the normalized year, make, and model applications shown below. Match manufacturer part number 7026S1, engine code, cylinder-head configuration, dimensions, position, material, and package quantity before ordering.
Key Features
- Performance camshaft profile identified by exact GSC part number and engine platform
- Lift, duration, lobe geometry, and intended power range are grind specific
- Valve springs, retainers, clearances, and engine management must match the selected profile
- Professional measurement and valvetrain setup are required before operation
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2008-2021 | Subaru | WRX STI | Confirm engine platform, cylinder-head configuration, dimensions, and exact GSC application |
Specifications
| Brand | GSC Power Division |
|---|---|
| Manufacturer Part Number | 7026S1 |
| Product Type | Camshafts |
| Fitment Type | Vehicle Specific |
| Condition | New |
What's Included
One new GSC Power Division camshafts package identified by manufacturer part number 7026S1, in the size and quantity stated by the title. Springs, retainers, locks, valves, guides, seals, followers, shims, bearings, fasteners, gaskets, lubricants, and other assembly parts are included only when expressly listed for this exact part number.
About GSC Power Division
GSC Power Division develops performance camshafts, valves, valve guides, springs, retainers, seals, and related valvetrain components for import and domestic engine platforms.
Related GSC Power Division Products
- Shop all GSC Power Division products
- GSC P-D 2008+ Subaru STi (EJ257 w/Dual AVCS) S2 Cams 272/272 Billet
- GSC Mitsubishi Evolution 4-8 4G63T Billet R1 Camshafts 268/268
- GSC P-D 02-05 Subaru WRX EJ205 S1 Cams 270/266 Billet
Frequently Asked Questions
Will this camshaft work with stock valve springs?
That depends on the exact cam profile, engine platform, installed height, spring pressure, and maximum lift. Confirm the required spring and retainer combination from current GSC data before assembly.
Does this camshaft require tuning?
A camshaft change can alter airflow, idle, and power delivery. Confirm engine-management and supporting-modification requirements for the exact grind with a qualified engine builder and tuner.
What must be measured during camshaft installation?
Verify valve-to-piston clearance, coil-bind clearance, retainer-to-seal clearance, lash or follower setup, timing, and every GSC or service-manual specification for the exact engine.
Installation Instructions
Follow current GSC Power Division instructions and the vehicle service manual for part number 7026S1. Have a qualified engine builder inspect the cylinder head and mating components, perform required machining, measure every specified clearance, verify timing and free movement, and use the correct lubrication, fasteners, torque procedures, and clean assembly practices before startup.
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