GSC Stopper-Style Exhaust Valve Guide +0.001" Single Mitsubishi 4B11T (GSC3013.001-1)
Oversized Fitment for Mitsubishi 4B11T Engines
Designed for precision and durability, the GSC Power Division stopper-style exhaust valve guide offers a +0.001" oversized fit for Mitsubishi 4B11T engines. This smooth-style guide (PN GSC3013.001-1) is ideal for performance builds requiring tighter tolerances and consistent valve control.
Standard and Oversized Options Available
Standard-size guides are available individually or in sets of 8. Oversized variants include +0.001" and +0.003", sold separately for custom tuning and high-load applications.
Technical Specifications
- Part Number: GSC3013.001-1
- Engine Fitment: Mitsubishi 4B11T
- Total Length: 1.735" / 44.07mm
- Outer Diameter: 0.4351" / 11.05mm
- Valve Stem Diameter: 5.5mm
Built for High-Performance Applications
GSC valve guides are trusted by engine builders for their precision machining and stopper-style design. Whether you're refreshing a street car or assembling a turbocharged track build, this oversized guide delivers reliable fit and long-term durability.Fitment:
- 2008 - 2015 Mitsubishi Lancer Evolution X (4B11T)
- 2009 - 2010 Mitsubishi Ralliart (4B11T)
- 2009 - 2020 Mitsubishi Outlander (4B11T Turbo Swap)
- 2018 - 2023 Mitsubishi Eclipse Cross (4B11T Turbo Swap)
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov

