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Doug's Headers D564 Full Length Header, 1-3/4 In, 64-67 GTO, CC

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#447D564

Doug's Headers D564 Full Length Header, 1-3/4 In, 64-67 GTO, CC

Specifically designed to fit the 64-67 GTO
They have 3/8" thick machined flanges that will not warp over time
Built with CNC mandrel tubes for an accurate fit and better flow

$1,105.22

Factory Shipped

$1,215.74

Save $110.52

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Product Summary

Long Tube Header Tube Type, D-port Exhaust Port Shape

Specifically designed to fit the 64-67 GTO
They have 3/8" thick machined flanges that will not warp over time
Built with CNC mandrel tubes for an accurate fit and better flow
Engineered to reduce backpressure and increases higher RPM horsepower
Tubes are pre-polished to remove scratches and the header is finished with a Metallic Ceramic Thermal Barrier Coating

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Key Specs

MFG. Part #	D564
Header Tube Type	Long Tube
Exhaust Port Shape	D-port
Flange Style	Standard
Primary Tube Diameter	1-3/4"

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Need To Know

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Doug's Headers D564 Details

Doug's PASSENGER CAR HEADERS Long Tube Metallic Ceramic CoatedHeader development and design is complex and requires a substantial amount of time and resources to do the job right! Many manufacturers are unwilling to make the commitment and instead offer compromised headers at lower prices. Doug's will not compromise performance, quality or fit to compete with inferior designs at cheap prices. Every Doug's header is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Doug's headers are carefully developed on the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.

3/8" Thick machined flanges... no warping
CNC mandrel bent tubes... accurate fit & better flow
Precision formed long transition collectors and long tube design... reduces backpressure and increases higher RPM horsepower
Heavy 16 gauge tubing... longer life
Tubes are pre-polished to remove scratches and the header isfinished with a Metallic Ceramic Thermal Barrier Coating polished to a high luster appearance offering corrosion and heat resistance up to 1400 degrees

Doug's Headers D564 1 3/4" 4-Tube Full Length Header Pontiac GTO 326-455 64-67 Metallic Ceramic Coating
Ceramic Coated
Collector: 3
Port: D
Primary: 1 3/4
exc. states w/Calif. emission stds
fits W/Milodon oil pans 30355
31660
31665
removal/modification of locking Strg column reqd
factory heads w/o end bolt holes must be drilled and tapped
Use 64-65 Z-Bar 9776376
removal/modification of locking Strg column req
with Floor Shifter
with A/C
For Off-Road Use Only

Doug's Headers D564 1 3/4" 4-Tube Full Length Header Pontiac GTO 326-455 64-67 Metallic Ceramic Coating
Ceramic Coated
Collector: 3
Port: D
Primary: 1 3/4
exc. states w/Calif. emission stds
fits W/Milodon oil pans 30355
31660
31665
removal/modification of locking Strg column reqd
factory heads w/o end bolt holes must be drilled and tapped
Use 64-65 Z-Bar 9776376
removal/modification of locking Strg column req
with Floor Shifter
with A/C
For Off-Road Use Only

Application

1964-1966 Pontiac GTO 6.4L/389 V8
1967 Pontiac GTO 6.6L/400 V8
1964-1967 Pontiac LeMans 5.3L/326 V8
1964-1967 Pontiac Tempest 5.3L/326 V8
1967 Pontiac Tempest 7L/428 V8

Charts

Installation Instructions (PDF)

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Aeromotive & PerTronix Black Friday 10% Off Sale

Black Friday Savings Are Here! From November 1 2026 through November 30 2026, save 10% on all Aeromotive and PerTronix products, including top performance brands like Doug's Headers, Taylor Cable, and JBA Performance Exhaust. Whether you're upgrading your fuel system, ignition components, headers, spark plug wires, or exhaust setup, this limited-time offer makes it easy to get premium performance parts at a great price. No coupon required, just shop qualifying Aeromotive and PerTronix brands and enjoy instant savings all month long.

Guides & Documents

Headers Installation Instructions (447D564)

CARB Warning

For use on pre-1966 vehicles only

Emissions warning: this part only legal for sale or use in California if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. ++any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering there are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

CARB warning

Doug's Headers D564 Specifications

KEY SPECS
MFG. Part #	D564
Brand	Doug's Headers
Header Tube Type	Long Tube
Exhaust Port Shape	D-port
Flange Style	Standard
Primary Tube Diameter	1-3/4"
Material Type	Steel
Color	Silver
Weld-Up	No
Collector Diameter	3 Inch
Finish	Ceramic Coated
Hardware Included	Yes
Gasket(s) Included	Yes

GENERAL
Sold in Quantity	Pair
GTIN Code	694342509781

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Fitment

1959-1966 Pontiac Bonneville

389 Pontiac V8

1959-1966 Pontiac Catalina

389 Pontiac V8

1962-1966 Pontiac Grand Prix

389 Pontiac V8

1964-1966 Pontiac GTO

389 Pontiac V8

1963-1966 Pontiac LeMans

389 Pontiac V8

1959-1966 Pontiac Star Chief

389 Pontiac V8

1961-1966 Pontiac Tempest

389 Pontiac V8

1960-1961 Pontiac Ventura

389 Pontiac V8