Doug's Headers are a fixture in the motorsports aftermarket, pioneering quality muscle car performance headers for decades. Unlike the competition, Doug's Headers prides ourselves on superior design detail resulting in a hassle-free installation for any application.
| Download Name | File Size |
| D570.pdf | 368.13KB |
| D570-B.pdf | 368.13KB |
| Make | Model | Years | Engine | Fitment Notes |
| Pontiac | Firebird | 1970 | 5.7L / 350 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States |
| Pontiac | Firebird | 1971 | 5.7L / 350 / V8 7.5L / 455 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States Legal for use on 71-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-76 Firebird Emission Vehicles in 50 States |
| Pontiac | Firebird | 1972 | 5.7L / 350 / V8 7.5L / 455 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States Legal for use on 71-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-76 Firebird Emission Vehicles in 50 States |
| Pontiac | Firebird | 1973 | 5.7L / 350 / V8 7.5L / 455 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States Legal for use on 71-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-76 Firebird Emission Vehicles in 50 States |
| Pontiac | Firebird | 1974 | 5.7L / 350 / V8 7.5L / 455 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States Legal for use on 71-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-76 Firebird Emission Vehicles in 50 States |
| Pontiac | Firebird | 1975 | 5.7L / 350 / V8 7.5L / 455 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States Legal for use on 71-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-76 Firebird Emission Vehicles in 50 States |
| Pontiac | Firebird | 1976 | 5.7L / 350 / V8 7.5L / 455 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States Legal for use on 71-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-76 Firebird Emission Vehicles in 50 States |
| Pontiac | Firebird | 1977 | 5.7L / 350 / V8 6.6L / 403 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States Not Legal for use on 77-79 Firebird Emission Vehicles in 50 States |
| Pontiac | Firebird | 1978 | 5.7L / 350 / V8 6.6L / 403 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States Not Legal for use on 77-79 Firebird Emission Vehicles in 50 States |
| Pontiac | Firebird | 1979 | 5.7L / 350 / V8 6.6L / 403 / V8 6.6L / 400 / V8 |
Requires removal or modification of locking steering columns if equipped. Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing. Header will fit with Milodon oil pans 30355, 31660 & 31665 Fits D-Port heads Only. Full-length with Floor Shifter Legal for use on 70-74 Firebird Emission Vehicles in 50 States Not Legal for use on 75-79 Firebird Emission Vehicles in 50 States Not Legal for use on 77-79 Firebird Emission Vehicles in 50 States |
| Collector Attachment | 3-Bolt Flange |
| Collector Diameter | 3.0 IN |
| Collector Port Diameter | 3.0 IN |
| Cylinder Head Port Shape | D-PORT |
| Design | Full-length |
| Flange Thickness | 0.375 IN |
| Gasket Or Seal Included | Yes |
| Gaskets Included | Yes |
| Grade Type | Performance |
| Header Style | Full-length |
| Mounting Hardware Included | Yes |
| Oxygen Sensor Port | No |
| Part Type | Exhaust Header |
| Port Shape | D-Port |
| Primary Tube Outside Diameter | 1.75 IN |
| Proposition 65 | www.P65Warnings.ca.gov |
| Tube Wall Thickness | 16 GU |
| Warranty Time | 24 Months |
