GSC Exhaust Valve Guide – Toyota/BMW B58/S58 – GSC3131
Precision Exhaust Valve Guide for B58 & S58 Engines
The GSC Power-Division Exhaust Valve Guide is engineered for Toyota B58B30 and BMW S58 platforms. Featuring a 6mm valve stem fitment and a built-in stopper protrusion, this guide ensures secure installation and prevents valve guide drop during high-RPM operation.
Fitment and Options
Sold individually or in sets of 12. A full head requires 12 guides. Oversized options are available in +0.001" and +0.003" for custom-machined heads or tighter tolerances.
Seal Compatibility
Compatible with OEM hat-style valve stem seals or metal clad seals when using alternate spring seat setups. The stopper design aids in quick install and ensures long-term stability.
Key Features
- 6mm valve stem fitment for B58 and S58 engines
- Stopper protrusion for secure seating and anti-drop protection
- Compatible with multiple seal types for flexible build options
Specifications
| Stem Diameter | Total Length | Outer Diameter | Stopper Protrusion |
|---|---|---|---|
| 6mm | 43mm / 1.693" | 10.03mm / 0.3948" | 16.5mm / 0.650" |
Fitment:
- 2016–2023 BMW M240i / M340i / M440i 3.0L Turbo Inline-6 (B58B30)
- 2020–2025 BMW M3 / M4 / X3M / X4M 3.0L Twin Turbo Inline-6 (S58)
- 2021–2025 Toyota GR Supra 3.0L Turbo Inline-6 (B58B30)
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