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Mild Steel Header Flanges

Our 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. These header flanges are U.S. made.
Make sure to ask about custom header flanges.
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BBC Single header flange
Big Block Chevy Single Header Flange
Our Price: $14.95

This precision laser cut Big Block Chevy single 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 Big Block Chevy head.

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
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Buick Nailhead Mild Steel Header Flange
Buick Nailhead Header Flange
Our Price: $22.95

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. These Buick Nailhead header flanges are sold as a single flange, requires 2 flanges per head.
Port Size: 1.573"

Preformed flange stubs are 2"-3" long, and have one end perfectly formed to the port shape of the flange using the appropriate tubing size for that port. This can drastically decrease overall build time. If you have questions on sizing or other options, talk with one of our techs for more information.

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.

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Subaru EJ257 Mild Steel Header Flange
Subaru EJ257 Mild Steel Header Flange
Our Price: $22.95

Precision laser cut from 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 the Subaru EJ257 DOHC 16v boxer-4 engine found in 2004-present Impreza WRX STi's.
Port Size: 1.631"
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Chevy 3.4 Liter V6 Mild Steel Header Flange
Chevy 3.4 Liter V6 Header Flange
Our Price: $29.95

This precision laser cut Chevy 3.4 Liter V6 header flange is cut from 3/8" thick 1018 cold rolled steel, our header flanges are manufactured in the U.S. These header flanges are specifically made for the Chevy 3.4 Liter V6 head. more info
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
Chevy 4.3L V6 Mild Steel Header Flange
Chevy 4.3L V6 Header Flange
Our Price: $33.95

This precision laser cut Chevy 3.4 Liter V6 header flange is cut from 3/8" thick 1018 cold rolled steel, our header flanges are manufactured in the U.S. These header flanges are specifically made for the Chevy 3.4 Liter V6 head. more info
Aston Martin V-12 Mild Steel Header Flange
Aston Martin V-12 Mild Steel Header Flange
Our Price: $33.95

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 Aston Martin V-12 6.0L engine.
Port Size: 1.759"
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Jeep 3.8L V6 Mild Steel Header Flange
Jeep 3.8L V6 Mild Steel Header Flange
Our Price: $33.95

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 Jeep 3.8L V6 engines.
Port Size: 1.748"
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Porsche 911 Carrera 996 Mild Steel Header Flange
Porsche 911 Carrera 996 Mild Steel Header Flange
Our Price: $33.95

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 flat-6 engine of all 996-generation Porsche 911 variants from 1999-2004.
Port Size: 2.087"
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