Manley Performance Big Block Chevrolet Race Flo Valves Stock 3/8" Stem Diameters 1.880

Race Flo Valves Stock 3/8" Stem Diameters

- XH-426 Stainless Exhaust Materia
- Chrome Stems and Hard Tips
- Swirl Polished and Fully Machined
- Improved Flow with "Pro Flo" Underhead

Specs:

Type: Exhaust

Head Diameter: 1.880

Stem Diameter: .3715

Installed Height: Stock

O/A Length: 5.350

Tip Length: .220

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

Margin: .060

Seat Width: .100

Top of Head: 5° Dish

Weight/ Grams: 131

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