Listed is a pair of 3/8" Thick 304 Stainless Header Flanges For: Jon Kaase Racing BOSS 9 Semi-Hemi Heads. These flanges are specific to the Kaase Boss 9 Semi-Hemi Heads. Precision laser cut from 3/8" thick 304 stainless, our header flanges are manufactured in the U.S. and are machine surfaced.
