Manley Performance Severe Duty Valves Stem

Small Block Chevrolet Severe Duty Valves
5/16” (.311”) Stem.

• No Need for Inserted Tips or Wear Caps
• XH-428 Stainless Material
• NK-844 Stainless Intake Material
• Chrome Stems and Hard Tips
• Swirl Polished and Fully Machined
• Thin Stem for Increased Flow and Light Weight

Specifications:

Type: Exh.
Head Diameter: 1.600
Stem Diameter: .3110
Installed Height: .100 Longer
O / A Length: 5.040
Tip Length: .290
Underhead Angle/ Radius: 15° x 1/2”
Margin: .080
Seat Width: .100
Top Of Head: 9° Dish
Wgt /Grams: 94