SKU: 2091-01 | UPC: GSC2091-01
GSC P-D 2020-2024 Toyota Supra B58 / 2020-2024 BMW Z4 B58 / 2021-2024 BMW M3 M4 S58 Chrome Polished 28.5mm Head Exhaust Valve – Single
GSC Power-Division single chrome polished 28.5mm head exhaust valve fits Toyota Supra B58 engines and BMW Z4 B58 plus M3 M4 S58 platforms. Direct OEM replacement delivers better heat resistance and exhaust flow for turbocharged builds. Perfect for cylinder head work in high boost or high RPM setups pushing 1000+ hp.
Key Features
- Chrome Polished Stem: 6.38mm diameter cuts friction on guides and withstands exhaust temps to 1600°F
- 28.5mm Head Diameter: OEM exact with +1.00mm dish and 7.70mm thickness for drop-in fit and full exhaust flow
- One-Piece Forged Construction: High-temp alloy forging holds up to 40+ psi boost without fatigue
- Bead Blasted Head: Finish boosts airflow velocity and scavenging in B58 S58 heads
- Sodium Filled Design: Sodium inside speeds heat transfer from head to stem for cooler running and extended durability
Product Notes
- Sold individually order six for a complete engine set
- Valve length 112.30mm ensures exact installed height
- Packaged in protective sleeve to avoid shipping damage
Installation Notes
- Professional installation recommended.
- Check valve stem clearance and lap seats for tight seal
- Works with OEM or GSC valve springs and retainers
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020-2024 | Toyota | Supra | 3.0L Turbo B58 |
| 2020-2024 | BMW | Z4 | sDrive30i M40i B58 |
| 2021-2024 | BMW | M3 | Base Competition S58 |
| 2021-2024 | BMW | M4 | Base Competition S58 |
Why Choose GSC Power-Division?
- 20+ years building valvetrain parts for drag racing and road course victories
- Machined to micron levels for dependable power in 1000+hp B58 S58 engines
- Proven through real-world testing on engines around the globe
Frequently Asked Questions
- Q: Will this valve fit both B58 and S58 engines?
A: Yes identical head and stem dimensions make it a direct fit for all B58 and S58 cylinder heads in listed models - Q: What alloy and finish are used?
A: Forged 21-4N or Inconel-equivalent heat-resistant alloy with swirl polished chrome stem plating for wear protection - Q: What warranty applies and is DIY install possible?
A: 1-year unlimited mileage warranty against breakage professional install advised to ensure proper seating and lash
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Protective plastic sleeve inside 8 x 3 x 1 inch box
- Weight: 0.15 lbs
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