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 |
| D564.pdf | 339.52KB |
| Make | Model | Years | Engine | Fitment Notes |
| Pontiac | GTO | 1964 | 6.4L / 389 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | GTO | 1965 | 6.4L / 389 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | GTO | 1966 | 6.4L / 389 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | GTO | 1967 | 6.6L / 400 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | LeMans | 1964 | 5.3L / 326 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | LeMans | 1965 | 5.3L / 326 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | LeMans | 1966 | 5.3L / 326 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | LeMans | 1967 | 5.3L / 326 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | Tempest | 1964 | 5.3L / 326 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | Tempest | 1965 | 5.3L / 326 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | Tempest | 1966 | 5.3L / 326 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| Pontiac | Tempest | 1967 | 5.3L / 326 / V8 | Fits D-Port heads Only. 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. Application with scatter shield or factory bell housings with dual starter pockets must use WIX oil filter PN 51522 or equivalent. Header will fit with Milodon oil pans 30355, 31660 & 31665. Full-length with Floor Shifter |
| 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 |
