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Doug's Headers D743 Full Length Header, 1-7/8 In, 65-75 Cutlass, CC
Doug's Headers D743 Full Length Header, 1-7/8 In, 65-75 Cutlass, CC

Doug's Headers D743 Full Length Header, 1-7/8 In, 65-75 Cutlass, CC

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Doug's Headers D743 Full Length Header, 1-7/8 In, 65-75 Cutlass, CC
Doug's Headers D743 Full Length Header, 1-7/8 In, 65-75 Cutlass, CC
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We estimate this item will ship on or before November 28th.
Part # 447D743
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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.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


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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)


1968-1969 Oldsmobile 442 6.6L/400 V8
1968-1971 Oldsmobile 442 7.5L/455 V8
1975 Oldsmobile Cutlass Salon 7.5L/455 V8
1968-1969 Oldsmobile Cutlass 6.6L/400 V8
1968-1974 Oldsmobile Cutlass 7.5L/455 V8
1975 Oldsmobile Delta 88 6.6L/400 V8
1971-1975 Oldsmobile Delta 88 7.5L/455 V8
1968-1969 Oldsmobile Vista Cruiser 6.6L/400 V8
1970-1974 Oldsmobile Vista Cruiser 7.5L/455 V8


  • Doug's Headers D743 1 7/8" 4-Tube Full Length Header Olsmobile Cutlass 455 65-75 Metallic Ceramic Coating
  • Ceramic Coated
  • Collector: 3 1/2
  • Port Shape: SAP
  • Primary Tube: 1 7/8
  • emissions code: legal only for off-highway use (except in California or states that have adopted California emission standards)
  • with A/C
  • with Floor Shifter
Some parts are not legal for use in California or other states with similar laws/regulations

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