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Doug's Headers D3337 Full Length Header, 1-3/4 In, 67-69 Nova, CC
Doug's Headers D3337 Full Length Header, 1-3/4 In, 67-69 Nova, CC

Doug's Headers D3337 Full Length Header, 1-3/4 In, 67-69 Nova, CC

Chevy Small Block V8, Chevy Big Block V8, Pontiac V8, Full-length Header Tube Type, Steel

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Doug's Headers D3337 Full Length Header, 1-3/4 In, 67-69 Nova, CC
Doug's Headers D3337 Full Length Header, 1-3/4 In, 67-69 Nova, CC
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We estimate this item will ship on or before September 25th.
Part # 447D3337
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 2 business days for Dougs Headers to ship this item.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


Header Tube Type:
Metallic Ceramic Coating
Flange Style:
Round Port
Primary Tube Diameter:
Material Type:
MFG. Part #:
Collector Diameter:
3 Inch
Hardware Included:
Gasket(s) Included:
Sold in Quantity:
GTIN Code:


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

Installation Instructions (PDF)


1967 Chevrolet Camaro 4.6L/283 V8
1967-1969 Chevrolet Camaro 4.9L/302 V8
1967-1969 Chevrolet Camaro 5.3L/327 V8
1967-1969 Chevrolet Camaro 5.7L/350 V8
1968-1969 Chevrolet Camaro 5L/307 V8
1967-1969 Chevrolet Camaro 6.5L/396 V8
1969 Chevrolet Camaro 7L/427 V8
1968 Chevrolet Chevy II 5.3L/327 V8
1968 Chevrolet Chevy II 5.7L/350 V8
1968 Chevrolet Chevy II 5L/307 V8
1968 Chevrolet Chevy II 6.5L/396 V8
1969-1974 Chevrolet Nova 5.7L/350 V8
1969-1973 Chevrolet Nova 5L/307 V8
1969 Chevrolet Nova 6.5L/396 V8
1970-1972 Chevrolet Nova 6.6L/402 V8
1970-1971 Chevrolet Nova 7.4L/454 V8
1967 Pontiac Firebird 5.3L/326 V8
1968-1969 Pontiac Firebird 5.7L/350 V8
1967-1969 Pontiac Firebird 6.6L/400 V8


  • Doug's Headers D3337 1 3/4" 4-Tube Full Length Header Chevrolet LS1 Engine Swap Camaro 67-69 Nova 68-74 Metallic Ceramic Coating
  • Ceramic Coated
  • Collector: 3
  • Port: SAP
  • Primary: 1 3/4
  • exc. states w/Calif. emission stds
  • Incl. 3 in. to 2.5 in. reducers W/ O2 fittings
  • Incl. O2 sensor extension harness
  • LS1/LS6 eng
  • Requires LS1 adapter plate kit PN SK100
  • with A/C
  • For Off-Road Use Only
Some parts are not legal for use in California or other states with similar laws/regulations

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