Manley Performance Big Block Chevrolet Severe Duty "Pro Flo" Valves Stock 3/8" Stem Diam

Severe Duty "Pro Flo" Valves Stock 3/8" Stem Diameters

- XH-428 Stainless Exhaust Material
- Improved Flow with "Pro Flo" Underhead
- Chrome Stems and Hard Tips
- Swirl Polished and Fully Machined

Specs:

Type: Exhaust

Head Diameter: 1.880

Stem Diameter: .3715

Installed Height: Stock

O/A Length: 5.374

Tip Length: .220

Underhead Angle/Radius: Pro Flo: 10° x 3/8"

Margin: .085

Seat Width: .100

Top of Head: 5° Dish

Weight/ Grams: 132

Set of 8