The EC Stainless Steel Valve made for the Briggs Model 28 12hp Flathead.

Valve Specs:
Head Diameter: 1.700”
Stem Diameter: .311”
Tip Length: .280”
Stock Length: Yes
Maximum Length: 5.142”
Angle: 30°
Margin: .050”
Seat Width: .125”
Top of Head: Dished