GSC Power Division 3059-8 Valve Guide Set for 1990-1997 Mazda Miata 1.6L/1.8L

Vehicle Fitment

• 1990-1993 Mazda Miata MX-5 (1.6L I4, B6-ZE DOHC, RWD)
• 1994-1997 Mazda Miata MX-5 (1.8L I4, BP-ZE DOHC, RWD)

Fitment Notes

• Fits both intake and exhaust positions - one part number covers all 8 guides in the head.
• This is a stopper-style valve guide. Do not use with heads requiring smooth (non-stopper) style guides.
• Oversized variants (+0.001" and +0.003" OD) are sold individually under separate part numbers and are not included in this set.

Features

• Manufactured from true C67410 Manganese Bronze for superior heat dissipation and long-term wear resistance.
• Stopper-style design ensures proper seating depth and prevents guide migration during use.
• CNC-turned on dedicated precision turning centers for industry-leading concentricity and tolerance.
• True-to-size OD reduces unnecessary honing of guide bosses on well-maintained cylinder heads.
• Dual-function fitment - serves both intake and exhaust positions in the B6/BP cylinder head.
• Improved thermal conductivity compared to OEM cast iron guides for better valve cooling.
• Compatible with both standard and performance valve stem seal applications.
• Shaped to improve airflow around the guide bore versus a direct OEM copy design.

Specifications

• Position: Intake and Exhaust (dual-use)
• Material: C67410 Manganese Bronze
• Total Length: 1.775" / 45.09mm
• Outer Diameter: 0.4354" / 11.06mm
• Valve Stem Diameter: 6mm
• Style: Stopper-style
• Application: Mazda B6-ZE (1.6L) / BP-ZE (1.8L) DOHC

Included Components

• 8x GSC Manganese Bronze Intake/Exhaust Valve Guides (standard size)

Product Description

The GSC Power Division 3059-8 is a complete set of eight Manganese Bronze valve guides engineered for the Mazda Miata MX-5 equipped with the 1.6L B6-ZE or 1.8L BP-ZE DOHC engine. Unlike the OEM cast iron guides, these are machined from true C67410 Manganese Bronze, a material that offers better thermal conductivity and natural lubricity - both critical during high-RPM or forced-induction operation. The stopper-style design keeps each guide locked in its proper seating depth throughout the life of the engine build.

A single part number covers all eight positions (intake and exhaust), simplifying ordering for a full head rebuild. GSC machines these guides to extremely tight tolerances on dedicated CNC turning centers, which reduces fitting time and minimizes guide boss honing for installers. Whether you're refreshing a high-mileage street engine or building a track-ready Miata, the 3059-8 is the direct upgrade over worn OEM guides.