Big Block Chevy 5.3" Bore Space Mild Steel Header Flange

Precision laser cut form 3/8" thick mild steel, our header flanges are manufactured in the U.S. and are machine surfaced. These header flanges are specifically made for 5.3" Bore space Big Block Chevy heads. These flanges do fit the Sonny's 5.3" bore space heads.

Port Size: 2.502"

We carry over 250 different header flange designs, so if you don't see the flange you're looking for, talk with one our tech reps about custom header flange cutting.

Flanges sold separately.