Chevy Gen III/IV LS Round Port- Billet CNC Stainless Header Flanges

Precision milled from 3/8" 304 stainless steel, these Chevy LS Gen III/IV Round Port CNC machined header flanges are the perfect touch to finish off that next custom set of headers. Designed for a lightweight profile, snap-fit ports, and a beautiful finish, these CNC machined header flanges are second to none. They all come standard with chamfered edges, and precision milled ports.

These Chevy LS Gen III/IV Round Port CNC Machined flanges are sold AS A PAIR.

They are available in 1 3/4", 1 7/8", 2", 2 1/8" or 2 1/4" port sizes.

These flanges fit all conventional LS1, LS2, LS3, LS6, LS7, LSx, LSA, and aftermarket LS cylinder heads with a conventional bolt pattern and port location.

See our custom CNC Flange listing for unique header flanges with custom variants such as:

• Various material types & thicknesses
• Any engine/cylinder head combination
• O-Ring grooves with O-Ring installation
• Counterbore for a tubing land
• Lightened flanges
• Port Blend- requires a non round port.

 CNC Machined flanges are FINAL SALE. We will not accept refunds or returns on these products.

Every flange will be precision skimmed to ensure flatness and straightness. All bolt holes and flange port holes will be precisely chamfered for a smooth, bur free edge.