GSC Power Division 3013-8 Manganese Exhaust Valve Guides Stopper Style 4B11T Evo

Vehicle Fitment

• 2008-2015 Mitsubishi Lancer Evolution X (4B11T, AWD)

Fitment Notes

• Stopper-style guide - verify that your cylinder head is machined to accept a guide with a stopper collar before ordering; the traditional smooth exhaust equivalent for the 4B11T is GSC 3011-8.
• Not compatible with 4G63-based Evo I-IX or DSM platforms - the 4B11T uses a smaller 5.5mm valve stem diameter and a different OD (0.4351" / 11.05mm).
• Standard OD sizing; light honing of the guide boss may be required depending on head condition and target clearance specification.
• Oversized OD options (+0.001" and +0.003") are available individually for heads requiring bore service.

Features

• Manufactured from true C67410 Manganese Bronze for superior lubricity, heat dissipation, and long-term wear resistance over OEM cast iron guides.
• Stopper collar provides a positive depth-stop during installation, ensuring all eight exhaust guides are driven to a consistent seating depth without repeated measuring or checking.
• CNC-turned on dedicated precision turning centers to maintain the tightest OD-to-ID concentricity tolerances in the segment.
• True-to-size OD minimizes guide boss honing on heads that don't require bore service, reducing overall installation time.
• Consistent dimensional accuracy ensures uniform valve-to-guide clearances across all eight exhaust positions.
• Compatible with GSC 4B11T exhaust valves, valve stem seals, and spring kits for a complete matched valvetrain rebuild.

Specifications

• Position: Exhaust
• Style: Stopper Style (with collar)
• Material: Manganese Bronze (proprietary C67410 blend)
• Total Length: 1.735" / 44.07mm
• Outer Diameter: 0.4351" / 11.05mm
• Valve Stem Diameter: 5.5mm
• Application: Mitsubishi 4B11T (Lancer Evolution X)

Included Components

• 8x GSC Power Division Manganese Bronze Stopper-Style Exhaust Valve Guides (Standard OD)

Product Description

The GSC Power Division 3013-8 is a set of eight stopper-style Manganese Bronze exhaust valve guides engineered for the Mitsubishi 4B11T engine in the 2008-2015 Lancer Evolution X. It is the stopper-collar version of the 3011-8 - sharing the same dimensions (1.735" / 44.07mm length, 0.4351" / 11.05mm OD, 5.5mm stem) but with an integrated collar that seats against the guide boss during installation, eliminating the need to manually verify seating depth on each of the eight exhaust positions. This makes the 3013-8 the preferred choice for builders who want a faster, more consistent installation process.

Like all GSC valve guides, the 3013-8 is turned from true C67410 Manganese Bronze on dedicated CNC precision turning centers, holding tighter OD-to-ID concentricity tolerances than any OEM replacement. Minimal honing is required on heads with undamaged guide bosses. For heads requiring bore service, individually sold +0.001" and +0.003" oversized options are available separately. Builders who prefer no collar should reference the smooth-style 3011-8 instead.

A natural component of any 4B11T head build, the 3013-8 pairs directly with GSC's Evo X exhaust valves, valve stem seals, and beehive or conical spring kits for a fully matched high-performance valvetrain on the Lancer Evolution X platform.