Precision laser cut from 3/8" thick 304 stainless, our header flanges are manufactured in the U.S. and are machine surfaced. This header flange fits a variation of GM 4.2L applications: Rainier, Trail Blazer, Colorado, Envoy, Hummer, Ascender and Saab 9-7X.
Port Size: 1.715"
We carry over 250 different header flange designs, so if you don't see the flange you're looking for, talk with one of our tech reps about custom header flange cutting.
Flanges Sold Separately
