Photo of Hedman headers for1970-81 Pontiac Trans-Am 326-455 28150- headers for  70-81 Trans-Am 326-455 Hedman headers for  70-81 Trans-Am 326-455 What happens when you use standard headers on aftermarket cylinder heads? Some factory Pontiac heads require front & rear manifold bolt holes be drilled. 28150- headers for 1970-81 Trans-Am 326-455
Some factory Pontiac heads require front & rear manifold bolt holes be drilled.

Standard Uncoated Hedders; 1-3/4" Tube Dia; 3" Coll; FULL LENGTH Design

Standard Uncoated Hedders; 1-3/4" Tube Dia.; 3" Coll.; FULL LENGTH Design

Product Specifications

(PLEASE REVIEW THE FOLLOWING PRODUCT SPECIFICATIONS & FOOTNOTES THOROUGHLY)

  • Tube Diameter 1-3/4"
  • Tube Style Long Tube
  • Collector Style Ball and Socket Style (Gasketless)
  • Air Conditioning Yes
  • Automatic Transmission - Column No
  • Automatic Transmission - Floor Yes
  • Manual Transmission - Column Yes
  • Manual Transmission - Floor Yes
  • Collector Attachment 3"
  • Collector Size 3"
  • Contents One pair of headers, head flange gaskets, collector flange gaskets (when applicable), 3-bolt exhaust adapters, mounting hardware
  • E.O. # Yes
  • Emissions Notes EO# D167-27 (click here for covered vehicles in document on ARB.CA.GOV website)
  • Exhaust System Dia 2-1/2"
  • Finish Uncoated
  • Flange Style Standard
  • Flange Thickness 0.25"
  • Header Style Long Tube
  • Notes 70-81 Trans-Am 326-455
  • Power Steering Yes
  • Material Mild Steel
  • Tube Design LONG TUBES
  • Tube Length Long Tubes
  • Tube Material Thickness 18g
  • Tube Size 1-3/4"
  • Variations 28156
  • with A.I.R. System No
  • with EGR No
  • Weld-Up No
  • Reducer Outlet Size 2-1/2"
  • Tuned No
  • Bolts/Studs Included Yes
  • Catalytic Converter(s) Included No
  • Crossover Pipe Included No
  • Gasket Or Seal Included Yes
  • Installation Hardware Included Yes
  • Motor Mounts (Included) No
  • Mounting Hardware Included Yes
  • Reducers Included Yes
  • Transmission Mount/Crossmember (Included) No
  • Y-Pipe Included No
  • Quantity Sold as a pair.
  • Primary Tube Gauge 18g
  • Primary Tube Diameter (in) 1.75"
  • Package Contents One pair of headers, head flange gaskets, collector flange gaskets (when applicable), 3-bolt exhaust adapters, mounting hardware
  • Header Material Mild Steel
  • Header Finish Uncoated
  • Cylinder Head Port Shape Oval
  • Cylinder Head Stock Profile Heads
  • Header Construction Standard-Duty
  • Replacement Gasket 27600
  • Replacement Head Flange Gasket 27600
  • California Proposition 65 WARNING: Cancer. For more info visit www.P65Warnings.ca.gov

Vehicle Applications

      YearC.I.D.LiterCylindersDrive Type
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnYes
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (23) Some heads require drilling and tapping of end holes.
      (4) Includes parts necessary to retain emission devices. (50 State)
      (6) Modification to stock exhaust required to retain catalytic converter.
      Not For Ram Air III or IV style heads.
      E.O. NumberD167-27
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