Due to the location of the oil filter on these vehicles, relocation of the oil filter may be required to provide header tube clearance. We recommend the use of a Trans-Dapt Performance Products' #1120 (cast aluminum), or Hamburger's Performance Products #3365 (billet aluminum) oil filter relocation kit. 

• 1970-74 Pontiac Grand Prix 326, 455
• 1964-77 Pontiac GTO, Lemans, Tempest 326,389,455
• 1967-81 Pontiac Firebird 326, 455
• 1973-77 Pontiac Grand AM, Lemans 326, 455
• Without smog injection or injection heads.
• Except round ports.
• Three tube design.
• Some heads require drilling and tapping of end holes.
• Includes parts necessary to retain emission devices. (50 State)
• Not legal for sale or use in California on pollution controlled motor vehicles.
• Modification to stock exhaust required to retain catalytic converter.
• For vehicles 1964 through 1974 without A.I.R. systems, considered as O.E.M. replacement parts when existing emission controls are not removed from vehicle.
• 1975-1979 only, 50 state legal for these years only.
• EO#D167-27

Hedman Hedders has been manufacturing quality headers in the USA since 1954, and they've been manufacturing long and MID-LENGTH tube headers for Pontiac models for decades. Each set uses mild steel, smooth flowing, CNC mandrel bent tubes, that are hand-welded to ensure each pair is identical to the next. Hedman's unique, gasketless ball and socket collector design allows your Firebird, GTO, Lemans, Grand Prix or Tempest exhaust system to bolt up, even if it is not perfectly aligned with the header collectors.

The LONG-TUBE design provides ample exhaust flow to let your 326-455 Pontiac engine breathe easy, and produce maximum horsepower and torque.  These headers are uncoated, and ship from the factory with a temporary black paint that will burn off when submitted to normal operating temperatures. They are also available with a ceramic-metallic finish.

Each set includes a pair of gaskets, header flange bolts and collector bolts. No collector gasket is needed. Hedman Hedders is so confident in the quality of its headers that these headers are factory backed by a Limited Lifetime Warranty.