Hedman 28140 Exhaust Headers 1967-81 Various Pontiac Cars 326-455.

Installation Kit Included

Hedman - Made in the USA


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3 in stock

Hedman 28140
Exhaust Headers

NOTE: The paint applied to these headers is a temporary coating only and is designed to burn off during use. High temperature paint or other high temperature coatings are recommended.


1967-1979 Firebird
1973-1975 Grand Am
1972-1974 Grand Prix
1964-1973 GTO
1964-1977 LeMans
1964-1970 Tempest


Tube Diameter 1-5/8 in. x 2 in.
Tube Style Long Tubes
Collector Style BALL and SOCKET Style (Gasketless)
Air Conditioning Yes
Collector Attachment 3 in.
Collector Diameter 3 in.
Collector Size 3 in.
Reducer Outlet Size 2-1/2 in.
Exhaust System Diameter 2-1/2 in.
Contents headers, gaskets (when applicable), 3-bolt exhaust adapters, hardware
E.O. # Yes
Emissions Notes EO# D167-27 (click here for covered vehicles in document on ARB.CA.GOV website)
Finish Uncoated
Finish Type UNCOATED Mild Steel! Shipped with Temporary Paint.
Flange Style Standard
Flange Thickness 0.3125 in.
Header Port Shape Oval Port
Header Style Long Tube
Notes 64-81 Various Pontiac Cars 326-455
Port Shape Oval
Power Steering Yes
Material Mild Steel
Tube Design Standard
Tube Length Long Tubes
Tube Material Thickness 16g
Tube Size 1-5/8 in. x 2 in.
Variations 28146
Installation Notes Modification to reverse lockout (back drive) mechanism may be required.
Installation Notes Some heads may require drilling and tapping of end bolt holes.
With A.I.R. System No
With EGR No
Weld-Up No
Tuned No
Bolts/Studs Included Yes
Catalytic Converter(s) Included No
Collector Bolts Included Yes
Crossover Pipe Included No
Gasket or Seal Included Yes
Header Fasteners Included Yes
Installation Hardware Included Yes
Motor Mounts Included No
Mounting Hardware Included Yes
Reducers Included Yes
Y-Pipe Included No
Quantity Sold as a pair.
Primary Tube Gauge 16g
Primary Tube Diameter 1.625 in. x 2 in.
Package Contents Headers, ball and socket reducers (exhaust adapters), gaskets, mounting hardware
Header Material Mild Steel
Header Finish Uncoated
Cylinder Head Port Shape Oval
Cylinder Head Stock Profile Heads
Header Construction MILD STEEL- Standard-Duty
Replacement Gasket 27600
Replacement Head Flange Gasket 27600


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