What happens when you use standard headers on aftermarket cylinder heads?

STAINLESS STEEL Hedders; 1-5/8 in. Tube Dia; FULL LENGTH Design-HTC Coated

STAINLESS STEEL Headers; 1-5/8 in. Tube Dia.; 3 in. Coll.; FULL LENGTH Design- HTC Coated

Product Specifications

(PLEASE REVIEW THE FOLLOWING PRODUCT SPECIFICATIONS & FOOTNOTES THOROUGHLY)

  • Tube Diameter 1-5/8 in.
  • Tube Style Long Tube
  • Collector Style Ball and Socket Style (Gasketless)
  • Air Conditioning Yes
  • Automatic Transmission - Column Yes
  • Automatic Transmission - Floor Yes
  • Manual Transmission - Column No
  • Manual Transmission - Floor Yes
  • Collector Attachment 3 in.
  • Collector Size 3 in.
  • Reducer Outlet Size 2-1/2 in.
  • Exhaust System Dia 2-1/2 in.
  • Contents headers, gaskets (when applicable), 3-bolt exhaust adapters, hardware
  • E.O. # No
  • Emissions Notes NOT LEGAL FOR STREET USE ON '75-LATER MODEL YEARS! Legal for off-road use only.
  • Finish HTC Polished Silver Ceramic-Metallic
  • Finish Type HTC SILVER (polished) Ceramic-metallic Coating
  • Flange Style Standard
  • Flange Thickness 0.375 in.
  • Header Style Long Tube
  • Notes 63-82 Corvette 283-400
  • Power Steering Yes
  • Product Info Manufactured using 304 Stainless steel then HTC Ceramic-Metallic Coated. Sturdy 3/8 in. Flanges and 16 gauge tubing
  • Material T304 Stainless Steel
  • Tube Design LONG TUBES
  • Tube Length Long Tubes
  • Tube Material Thickness 16g
  • Tube Size 1-5/8 in.
  • Variations 68306, 68308
  • with A.I.R. System No
  • with EGR No
  • Weld-Up No
  • Tuned No
  • Bolts/Studs Included Yes
  • Catalytic Converter(s) Included No
  • Crossover Pipe Included No
  • Gasket Or Seal Included Yes
  • Installation Hardware Included Yes
  • Motor Mounts (Included) No
  • Mounting Hardware Included Yes
  • Reducers Included Yes
  • Transmission Mount/Crossmember (Included) No
  • Y-Pipe Included No
  • Quantity Sold as a pair.
  • Primary Tube Gauge 16g
  • Primary Tube Diameter (in) 1.625"
  • Package Contents Set of Headers, mounting hardware and gaskets
  • Header Material T304 Stainless Steel
  • Header Finish HTC Polished Silver Ceramic-Metallic
  • Cylinder Head Port Shape Oval
  • Cylinder Head Fits Factory GM Aluminum or Cast Iron, Angle Plug and Straight Plug Heads.
  • Header Construction T304 Stainless
  • Replacement Gasket 27520
  • Replacement Head Flange Gasket 27520
  • California Proposition 65 WARNING: Cancer & Reproductive Harm. For more info visit www.P65Warnings.ca.gov

Vehicle Applications

      YearC.I.D.LiterCylindersDrive Type
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      Emissions Notes1974 and earlier vehicles WITHOUT A.I.R.: Legal for use on '74-earlier vehicles without A.I.R.. Considered OEM replacement part, and do not require EO, when existing emission controls are not removed.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      (6) Modification to stock exhaust required to retain catalytic converter.
      Emissions NotesRACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      (6) Modification to stock exhaust required to retain catalytic converter.
      Emissions NotesRACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      (6) Modification to stock exhaust required to retain catalytic converter.
      Emissions NotesRACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      (6) Modification to stock exhaust required to retain catalytic converter.
      Emissions NotesRACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      (6) Modification to stock exhaust required to retain catalytic converter.
      Emissions NotesRACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      (6) Modification to stock exhaust required to retain catalytic converter.
      Emissions NotesRACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      (6) Modification to stock exhaust required to retain catalytic converter.
      Emissions NotesRACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      (6) Modification to stock exhaust required to retain catalytic converter.
      Emissions NotesRACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
      Vehicle Specific Information
      Air Conditioning1970 or later only- A/C equipped vehicles require bracket 20110.(Large piston compressor).
      Power SteeringYes
      Auto Transmission - ColumnYes
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (100) Will not fit steering damper inside front crossmember.
      (103) Will fit with angle plug heads (Chevy aluminum only, L98).
      (6) Modification to stock exhaust required to retain catalytic converter.
      Emissions NotesRACE ONLY! NOT LEGAL for public street or highway use on '75-later vehicles.
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