Honda | Exhaust Valve Guide (Over Size) | 12205-PNA-305

Restore proper valve-to-guide clearance with the Honda Exhaust Valve Guide (Over Size). This genuine Honda replacement is made for cylinder head rebuilds where the original guide bore has been reconditioned and now requires an over size guide to achieve the correct press fit. When installed and sized correctly, it helps keep the exhaust valve aligned and moving smoothly, supporting consistent sealing, stable compression, and long-term durability.

Key Features

• Genuine Honda valve guide for dependable fit and material quality
• Over size design for heads that have been machined to accept an over size guide
• Helps maintain correct valve stem support and alignment
• Supports improved oil control by reducing excess guide clearance
• Ideal for rebuilds addressing worn guides, poor sealing, or uneven valve wear

Why It Matters

Exhaust valve guides work under extreme heat and can wear over time. Excess clearance can contribute to oil consumption, inconsistent idle, reduced compression, and accelerated valve and seat wear. Replacing a worn guide with the correct over size guide during a rebuild helps bring the cylinder head back within specification for smoother operation and reliable performance.

Installation Notes

• Over size valve guides require accurate measurement and proper installation tools.
• After press-in, the guide may need to be finish-reamed or honed to achieve correct valve stem clearance.
• Professional machine shop installation is recommended for best results.