Severe Duty 1.71in. Exhaust Valves for Oldsmobile 330 / 455 Engines by Manley Performance
Manley's Severe Duty Exhaust Valves are constructed from XH-428 Stainless Steel for unparalleled durability. Chrome stems and hard tips are incorporated for enhanced longevity and wear resistance. The valves feature swirl polished under head areas and fully machined combustion faces to optimize airflow and combustion efficiency.
Measurements
- Head Diameter: 1.71in.
- Stem Diameter: 0.3415in.
- Installed Height: Stock
- O/A Length: 4.668in.
- Tip Length: 0.26in.
- Underhead Angle / Radius: 10°x3/8”
- Margin: 0.06
- Seat Width: 0.1
- Top of Head: 5° Dish
- Weight: 101g
