Speedmaster®
8mm LS Steel & Viton Dual/Single Spring Valve Stem Seals (Suits: 0.500" Guides)
Product Information
Overview
Valve stem seals control the lubrication of the valve stem as it slides in the valve guide. Too little oil causes stem and guide wear. Too much oil increases oil consumption and can cause a buildup of carbon, leading to valve seat damage and early valve grind. Speedmaster valve seals are posi-stop seals made from high-temperature Viton material for a long-lasting seal.
Specs
| Brand: | Speedmaster |
| Part Number: | PCE354.1004 |
| Part Type: | Valve Stem Seal |
| Valve Stem Diameter: | 8mm |
| Valve Stem Seal Type: | Positive stop |
| Valve Stem Seal Material: | Viton rubber |
| Machine Work Required: | No |
| Valve Guide Diameter (in): | 0.500 in. |
| Valve Stem Seal Outside Diameter (in): | 1.190 in. |
| Quantity: | Sold as a set of 16. |
| Notes: | Designed for Chevrolet LS |
Warranty Information
12-Month Limited Worldwide Warranty
Prop 65 Warning
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Installation Guide
Our AI assistant generates a step-by-step guide for this product — covering installation, maintenance, and troubleshooting.
This AI-generated guide is for general reference only and does not constitute official Speedmaster product documentation. Always verify fitment, torque specifications, and safety requirements before installation.