2 1/2" Round, GM Big Block Chevy, Sonny's 7x11, 5.00" Bore Space, 3/8" Thick, CNC Machined Header Flange. Available in mild steel or stainless steel.
**2 flanges are needed for a full set**
- Diameter:
 - 2 1/2"
 - Engine Make:
 - GM/ Chevy
 - Engine Family:
 - Big Block Chevy
 - Cylinder Head/ Engine:
 - Sonny's 7x11, 5.00" Bore Space
 - Port Shape:
 - Round
 - Thickness:
 - 3/8"
 - **Full Set:
 - 2 Required