Listed is a pair of 3/8" Thick 304 Stainless Header Flanges For: Musi Racing/Buck Racing/Sonny's Racing 5.3" Bore Space Big Block Chevy-Based ProMod Race Engine Cylinder Heads. Precision laser cut from 3/8" thick 304 stainless, our header flanges are manufactured in the U.S. and are machine surfaced.
