Home > Header Flanges > Mild Steel Header Flanges > GM Header Flanges
GM Header Flanges

Our American made GM header flanges are precision CNC laser jet cut from 3/8” stainless steel or 1018 cold rolled steel.
Stainless Header Mfg., Inc. offers the finest in CNC laser cut header flanges. While most header flanges are made from 1/4" or 5/16" material, our are precision CNC laser cut header flanges are cut from from 3/8" material. We offer our flanges in 304 stainless steel or 1018 cold rolled steel. The heavier material we use to fabricate our flanges greatly reduce the warping problems seen in other lighter flanges.
Make sure to ask about custom header flanges.
Sort By:
Page of 1
GM 4.3L V6 EcoTec3 LV3 Header Flange
GM 4.3L V6 Header Flange 1 5/8" Port
Our Price: $33.95

Precision laser cut from 3/8" thick mild steel, our header flanges are manufactured in the U.S. These header flanges are specifically made for the GM 4.3L V6. This flange has a square port dimension of 1.550" and is designed to be used with a 1 5/8" primary tube. more info
GM 4.3L V6 EcoTec3 LV3 Header Flange
GM 4.3L V6 Header Flange 1 3/4" Port
Our Price: $33.95

Precision laser cut from 3/8" thick mild steel, our header flanges are manufactured in the U.S. These header flanges are specifically made for the GM 4.3L V6. This flange has a rectangle port dimension of 1.710" by 1.610" and is designed to be used with a 1 3/4" primary tube. more info
GM 2.2 Liter Ecotec header flange
GM 2.2 Liter Ecotec Header Flange
Our Price: $34.95

This precision laser cut GM 2.2 Liter Ecotec header flange is cut from 3/8" thick 1018 cold rolled steel, our header flanges are manufactured in the U.S. and are machine surfaced. These header flanges are specifically made for the GM 2.2 Liter Ecotec head.
Port Size: 1.824"
We carry over 250 different header flange designs, so if you don't see the flange your looking for, talk with one of our tech reps about custom header flange cutting.

Flanges Sold Separately
more info
GM 2.3L Quad 4 Mild Steel Header Flange
GM 2.3L Quad 4 Mild Steel Header Flange
Our Price: $34.95

Precision laser cut from 3/8" thick mild steel, our header flanges are manufactured in the U.S.A. and are machine surfaced. These header flanges are specifically made for the GM 2.3L Quad 4 engines.
Port Size: 2.006"
more info
Chevy 4.2L Inline 6 DOHC Mild Steel Header Flange
Chevy 4.2L Inline 6 DOHC Header Flange
Our Price: $39.95

This precision laser cut Small Block Chevy header flange is cut from 3/8" thick 1018 cold rolled steel, our header flanges are manufactured in the U.S. This header flange fits a variation of GM 4.2L applications: Rainier, Trail Blazer, Colorado, Envoy, Hummer, Ascender and Saab 9-7X.
Port Size: 1.719"
We carry over 250 different header flange designs, so if you don't see the flange your looking for, talk with one of our tech reps about custom header flange cutting.

Flanges Sold Separately
more info
Saab 9-7x Vortec 4200 Mild Steel Header Flange
Saab 9-7x Vortec 4200 Mild Steel Header Flange
Our Price: $39.95

Precision laser cut from 3/8" thick mild steel, our header flanges are manufactured in the U.S.A. and are machine surfaced. These header flanges are specifically made for the 4.2L Vortec I-6 found in a variety of 2005-2009 GM SUV's.
Port Size: 1.719"
more info