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Doug's Headers D370Y Tri-Y Header, 78-88 G-Body, CC
Doug's Headers D370Y Tri-Y Header, 78-88 G-Body, CC

Doug's Headers D370Y Tri-Y Header, 78-88 G-Body, CC

Chevy Small Block V8, Pontiac V8, Tri-Y Header Tube Type, Hi-Temp Black, Oval Port Flange Style

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Doug's Headers D370Y Tri-Y Header, 78-88 G-Body, CC
Doug's Headers D370Y Tri-Y Header, 78-88 G-Body, CC
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We estimate this item will ship on or before November 21st.
Part # 447D370Y
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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:
Hi-Temp Black
Flange Style:
Oval Port
Primary Tube Diameter:
Material Type:
MFG. Part #:
Collector Diameter:
2-1/2 Inch
Hardware Included:
Gasket(s) Included:
Sold in Quantity:
GTIN Code:


Doug's PASSENGER CAR HEADERS Tri-Y Metallic Ceramic Coated

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 is finished 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)


1979-1982 Chevrolet El Camino 4.4L/267 V8
1978-1984 Chevrolet El Camino 5.7L/350 V8
1978-1987 Chevrolet El Camino 5L/305 V8
1979-1982 Chevrolet Malibu 4.4L/267 V8
1978-1983 Chevrolet Malibu 5.7L/350 V8
1978-1983 Chevrolet Malibu 5L/305 V8
1979-1982 Chevrolet Monte Carlo 4.4L/267 V8
1982-1984 Chevrolet Monte Carlo 5.7L/350 V8
1978-1988 Chevrolet Monte Carlo 5L/305 V8
1978-1981 Oldsmobile Cutlass 5.7L/350 V8
1978-1987 Oldsmobile Cutlass 5L/305 V8
1982-1984 Pontiac Bonneville 5.7L/350 V8
1983-1986 Pontiac Bonneville 5L/305 V8
1980-1981 Pontiac Grand Prix 4.3L/265 V8
1978-1980 Pontiac Grand Prix 4.9L/301 V8
1981-1984 Pontiac Grand Prix 5.7L/350 V8
1978-1987 Pontiac Grand Prix 5L/305 V8


  • D370Y 1 5/8"-2" Tri-Y Header G Body Metric Chassis Chev Malibu 78-83 El Camino 78-87 Monte Carlo 78-88 Cutlass Supreme 78-88 Calais 78-84 Crusier 78-87 Pontiac Grand Prix 82-86 Bonneville with 265-400 Chev Engines Metallic Ceramic Coating
  • Tri-Y Design - Ceramic Coated
  • Does not fit power glide transmission
  • Fits D-Port cyl. heads incl. ZZ4 crate engines
  • Fits most angle plug heads
  • req. left side A/C bracket P/N H7608
  • vehicles with short compressors can use stock bracket
  • Req. removal or modification of locking strg. c
  • with A/C
Some parts are not legal for use in California or other states with similar laws/regulations

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