GSC Power Division 3049-8 Manganese Bronze Exhaust Valve Guide Honda B-Series 6m

Vehicle Fitment

• 1989-2000 Honda Civic / CRX Si-R (B16A, JDM, FWD)
• 1994-2000 Honda Civic del Sol VTEC / Civic Si (B16A2 / B16A3, USDM, FWD)
• 1992-1993 Acura Integra GS-R (B17A1, USDM, FWD)
• 1994-2001 Acura Integra GS-R (B18C1, USDM, FWD)
• 1997-2001 Acura Integra Type R (B18C5, USDM, FWD)
• 1990-2000 Honda Integra Type R / SiR (B18C / B16B, JDM, FWD)

Fitment Notes

• For use with 6mm valve stem diameter exhaust valves only - this is the 6mm stem variant of the B-Series exhaust guide, designed for use with GSC's 6mm stem Super Alloy exhaust valves (GSC 2039-8) and similar 6mm stem aftermarket exhaust valves.
• The standard OEM B-Series exhaust valve uses a 5.5mm stem; the 5.5mm exhaust guide equivalent is GSC 3051-8. Confirm your exhaust valve stem diameter before ordering.
• Stopper-style guide - the stopper collar provides a positive installation depth reference; verify your head is configured to accept a stopper-collar guide before ordering.
• Intake guide equivalent (5.5mm stem, stopper style) is GSC 3052-8.
• 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 seat to a consistent depth without repeated measuring.
• 6mm stem bore pairs directly with GSC's 6mm stem Super Alloy exhaust valves for an optimally matched high-performance exhaust valvetrain.
• CNC-turned on dedicated precision turning centers to maintain the tightest OD-to-ID concentricity tolerances in the aftermarket.
• True-to-size OD minimizes guide boss honing on heads that don't require bore service, reducing overall installation time.
• Shaped to improve exhaust port airflow over the OEM guide profile.

Specifications

• Position: Exhaust
• Style: Stopper Style (with collar)
• Material: Manganese Bronze (proprietary C67410 blend)
• Valve Stem Diameter: 6mm
• Outer Diameter: 0.4750" / 12.07mm
• Application: Honda B-Series DOHC VTEC (B16A, B16A2, B16A3, B17A1, B18C, B18C1, B18C5)

Included Components

• 8x GSC Power Division Manganese Bronze Stopper-Style Exhaust Valve Guides - 6mm Stem (Standard OD)

Product Description

The GSC Power Division 3049-8 is a set of eight stopper-style Manganese Bronze exhaust valve guides for the Honda B-Series DOHC VTEC engine family, specifically designed for use with 6mm valve stem diameter exhaust valves. This is an important distinction from the standard B-Series exhaust guide: OEM B-Series exhaust valves use a 5.5mm stem (covered by GSC 3051-8), while the 3049-8 is the 6mm stem variant - designed as a direct pair for GSC's own 6mm stem Super Alloy exhaust valves (2039-8) and other performance aftermarket exhaust valves that use a 6mm stem for increased strength and heat capacity in high-power builds. Builders should confirm their exhaust valve stem diameter before ordering.

Made from true C67410 Manganese Bronze and CNC-turned to the tightest OD-to-ID concentricity tolerances in the aftermarket, the 3049-8 provides improved lubricity, heat transfer, and wear life compared to OEM cast iron guides - all of which matter in high-revving B-Series builds with aggressive cam profiles, forced induction, or sustained high-RPM track use. The stopper collar ensures all eight guides drive to a consistent installation depth automatically, eliminating the need to measure protrusion on each guide individually. Oversized OD options (+0.001" and +0.003") are available individually for heads requiring bore service.

A targeted component for performance B-Series head builds using 6mm stem exhaust valves, the 3049-8 complements GSC's full B-Series valvetrain lineup - including the 3052-8 stopper intake guide, spring kits, and valve stem seals - for a complete matched rebuild on any Civic Si, del Sol VTEC, Integra GS-R, or Integra Type R platform.