GSC Power-Division Exhaust Valve Guide for BMW & Toyota B58 / S58

The GSC Power-Division Exhaust Valve Guide is precision-machined for BMW and Toyota B58/S58 engines, providing proper valve alignment, durability, and reliability for both stock rebuilds and high-performance applications.

Standard-size guides are available as a set of 12 or individually, while oversized options are sold individually for cylinder head repairs and machining applications.

Fitment & Options

• Standard size: Sold as a set of 12 or individually

• Oversized options: +0.001" and +0.003" (sold individually)

Specifications

• Part Number: GSC3131

• Total Length: 1.693 in / 43 mm

• Outer Diameter: 0.3948 in / 10.03 mm

• Valve Stem Diameter: 6 mm

• Stopper Protrusion: 0.650 in / 16.5 mm

Features

• Compatible with OEM hat-style valve stem seals

• Can also be used with metal-clad seals when a different spring seat is required

• Stopper design helps prevent valve guide dropping and allows quicker, more secure installation

• Ideal for OEM replacement or performance engine builds

Standard sized sold as set of 12