Manley Performance Big Block Chevrolet Street Flo Valves Stock 3/8" Stem Diameters

Features

- NK-841 Stainless Intake Material
- Improved Flow with "Pro Flo" Underhead
- Chrome Stems and Hard Tips
- Swirl Polished and Fully Machined

Specification

Head Diameter: 2.250
Stem Diameter: .3715
Installed Height: Stock
O/A Length: 5.218
Tip Length: .220
Underhead Angle/Radius: Pro Flo: 10° x 3/8"
Margin: .050
Seat Width: .080
Top of Head: 5° Dish
Wgt/Grams: 138