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Pontiac Header Flanges

Our American Made Pontiac 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.

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Pontiac 400/455 Round Port Mild Steel Header Flange
Pontiac 400/455 Round Port Mild Steel Header Flange
Our Price: $34.95

Precision laser cut from 3/8" thick mild steel, our header flanges are specifically made for the Pontiac 400/455 cubic inch blocks used in a wide variety of Pontiac vehicles from 1955-1976.

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Pontiac 400/455 D-Port Mild Steel Header Flange
Pontiac 400/455 D-Port 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. and are machine surfaced. These header flanges are specifically made for the Pontiac 400/455 cubic inch blocks used in a wide variety of Pontiac vehicles from 1955-1976.
Port Size:1.801"
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Pontiac Ram Air IV Mild Steel Header Flange
Pontiac Ram Air IV 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. and are machine surfaced. These header flanges are specifically made for the rare Pontiac Ram Air IV heads, as well as aftermarket applications**
Port Size: 2.253"
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Pontiac Ram Air V Mild Steel Header Flange
Pontiac Ram Air V 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. and are machine surfaced. These header flanges are specifically made for the ultra-performance Pontiac Ram Air V engines found on the GTO and Firebird in 1969.
Port Size: 2.188"
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