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Doug's Headers D357Y Tri-Y Header, 1-5/8 In, 55-57 Chevy, CC
Doug's Headers D357Y Tri-Y Header, 1-5/8 In, 55-57 Chevy, CC

Doug's Headers D357Y Tri-Y Header, 1-5/8 In, 55-57 Chevy, CC

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Doug's Headers D357Y Tri-Y Header, 1-5/8 In, 55-57 Chevy, CC
Doug's Headers D357Y Tri-Y Header, 1-5/8 In, 55-57 Chevy, CC
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We estimate this item will ship on or before March 26th.
Part # 447D357Y
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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.


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Doug's PASSENGER CAR HEADERS Tri-Y Metallic Ceramic Coated Header 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 warping
  • CNC mandrel bent tubes... accurate fit & better flow
  • Tri-Y headers yield maximum power from off idle to 4500 RPM making them well suited for applications demanding maximum mid-range torque with maximum fuel economy
  • 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)


1956-1957 Chevrolet Bel Air 4.3L/265 V8
1957 Chevrolet Bel Air 4.6L/283 V8
1955-1956 Chevrolet Corvette 4.3L/265 V8
1957 Chevrolet Corvette 4.6L/283 V8


  • Doug's Headers D357Y 1 5/8" Tri-Y Header Chevrolet Passenger Car/Wagon Small Block Chevrolet 55-57 Metallic Ceramic Coating
  • Tri-Y Design - Ceramic Coated
  • Collector: 2 1/2
  • Port: OVL
  • Primary: 1 5/8 - 2
  • exc. states w/Calif. emission stds
  • Fits D-Port heads
  • Use orig. style V8 pitman arm
  • Fits 605 steering
  • Will not fit if eng. is 3/4+ in. forward
  • Fits TCI mount kit 725-7005-80
  • Fits W/Danchuk mounts
  • with A/C
  • For Off-Road Use Only
  • with Column Shift
  • with Floor Shifter
Some parts are not legal for use in California or other states with similar laws/regulations

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