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SKU: 2074-8
GSC P-D Toyota 3S-GTE 21-4N Chrome Polished Intake Valve 34.6mm Head +1mm Stem Set of 8 1990-1999 Celica ST185 ST205 MR2 SW20
Upgrade your Toyota 3S-GTE engine with GSC Power-Division's precision intake valves designed for Celica GT-Four ST185/ST205 and MR2 Turbo SW20 models from 1990 to 1999. This set of 8 valves features a 34.6mm head diameter and +1mm longer stem for improved airflow and valve train geometry. Experience reliable high-RPM performance with forged stainless steel construction that handles extreme boost levels.
Key Features
- Forged 21-4N Stainless Steel: High-strength material resists heat fatigue and maintains shape under high boost for consistent power delivery
- 34.6mm Oversized Head: Larger diameter increases intake airflow by up to 10% over stock for better cylinder filling and horsepower gains
- +1mm Longer Stem: Corrects valve train stack height in ported heads or aftermarket cams for precise timing and reduced wear
- Chrome Polished Stem: Mirror-like finish reduces guide friction improves sealing and extends valve life in turbo applications
- Swirl Polished Head with Hard Knife Edge: Enhances flow efficiency minimizes shrouding and promotes smoother combustion
Product Notes
- Valve lash specification 0.008-0.010 inch intake recommended for stock cams adjust for aftermarket profiles
- Break in with light load for first 500 miles to seat valves properly
- Ships in protective foam-lined box to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Inspect valve guides and seats for wear resurface if needed before install
- Compatible with OEM or aftermarket retainers and springs no special hardware required
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1990-1993 | Toyota | Celica | GT-Four ST185 3S-GTE |
| 1994-1999 | Toyota | Celica | GT-Four ST205 3S-GTE |
| 1991-1999 | Toyota | MR2 | Turbo SW20 3S-GTE |
Why Choose GSC Power-Division?
- Proven in World Rally Championship and drag racing with championship-winning teams
- Engineered for turbocharged engines with real-world dyno testing
- Made in USA with tight tolerances for drop-in reliability
Frequently Asked Questions
-
Q: Will these fit my ST205 Celica with a ported head?
A: Yes the +1mm stem length matches common ported 3S-GTE heads verify your stack height measurement before install -
Q: What finish is on the stem and head?
A: Stems receive chrome polishing for low friction heads are swirl polished with a hard knife edge for optimal flow -
Q: Is there a warranty on these valves?
A: GSC offers a one-year unlimited mileage warranty when installed by a certified professional
Shipping & Handling
- Method: Standard ground shipping
- Availability: In stock - ships same or next business day
- Packaging: Foam protected set in 8x6x2 inch box
- Weight: 0.95 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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