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

64-73 MUSTANG 351W Engine Swap Headers; 1-5/8 FULL-LENGTH Tube-Standard-Duty HTC

1964-73 For Mustang, 351W Engine Swap Headers; 1-5/8 in. FULL-LENGTH Tube Design; 3 in. Collector; Standard-Duty Model- HTC Polished-Silver Ceramic Coated

Hedman Hedders has been manufacturing quality headers in the USA since 1954, and they've been manufacturing Ford Mustang headers for nearly as long as Mustangs have been on the road. Each set uses mild steel,... (Read More)

Hedman Hedders has been manufacturing quality headers in the USA since 1954, and they've been manufacturing Ford Mustang headers for nearly as long as Mustangs have been on the road. Each set uses mild steel, smooth flowing, CNC mandrel bent tubes, that are hand-welded to ensure each pair is identical to the next. Hedman's unique, gasketless ball and socket collector design allows your exhaust system to bolt up to these 351W engine swap headers, even if it is not perfectly aligned with the header collectors.

These HTC coated, LONG-TUBE headers are designed specifically for swapping a 351W engine into (non-factory 351W equipped) 1964-73 Ford Mustang, Falcon, or '66-73 Ranchero, Torino. The engine must be centered between the framerails. These headers fit both automatic and manual transmissions, but won't work with 4 speed top-loader tranmissions, and clutch and shift linkage may be required. The smooth 1-5/8 in., oval port tube design tucks in tight to clear shock towers, and provide excellent flow to let your 351W engine breathe better, and produce excellent low-end torque and horsepower.

Each set includes a pair of gaskets, header flange bolts and collector bolts. No collector gasket is needed.

Hedman Hedders is so confident in the quality of its headers that these headers are factory backed by a Limited Lifetime Warranty. These headers have a high temperature, POLISHED-SILVER ceramic finish that resists corrosion, and can withstand temperatures up to 1400 degree F. This finish is covered by a 5-year factory warranty, in addition to Hedman's standard lifetime header warranty.

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Part#88666
$653.57
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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 No
  • 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 Header(s), new bolts, gasket(s) to head, reducer(s) and hardware, instructions
  • E.O. # No
  • Emissions Notes NOT LEGAL FOR STREET USE ON '75-LATER MODEL YEARS! Legal for off-road use only.
  • Engine Version Ford Windsor Block (W)
  • Finish HTC Polished Silver Ceramic-Metallic
  • Finish Type HTC SILVER (polished) Ceramic-metallic Coating
  • Flange Style Standard
  • Flange Thickness 0.25 in.
  • Header Port Shape Oval Port
  • Header Style Long Tube
  • Notes 64-73 Ford Mustang 351W
  • Key Feature Engine Swap
  • Port Shape Oval
  • Power Steering Yes
  • Material Mild Steel
  • Tube Design LONG TUBES
  • Tube Length Long Tubes
  • Tube Material Thickness 16g
  • Tube Size 1-5/8 in.
  • Variations 88660, 88668
  • with A.I.R. System No
  • with EGR No
  • Weld-Up No
  • Tuned No
  • Bolts/Studs Included Yes
  • Catalytic Converter(s) Included No
  • Collector Bolts Included Yes
  • 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 Yes
  • 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 Mild Steel
  • Header Finish HTC Polished Silver Ceramic-Metallic
  • Cylinder Head Port Shape Oval
  • Cylinder Head Stock Profile Heads
  • Header Construction Standard-Duty
  • Replacement Gasket 27700
  • Replacement Head Flange Gasket 27700
  • 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 ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (108) With automatic transmission, C-4 only.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      YearC.I.D.LiterCylindersDrive Type
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      YearC.I.D.LiterCylindersDrive Type
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
      Vehicle Specific Information
      Air ConditioningYes
      Power SteeringYes
      Auto Transmission - ColumnNo
      Auto Transmission - FloorYes
      Manual Transmission - ColumnNo
      Manual Transmission - FloorYes
      Footnotes(1) Without smog injection or injection heads.
      (157) When equipped with manual transmission, will not fit with Ford top loader trans.
      (221) Engine must be centered between frame rails, per instructions.
      (222) Modification to clutch linkage may be needed.
      (27) Power steering bracket 20120 required.
      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.
      Engine FamilySB FORD 351 (Windsor)
      Notes351W (Engine swap)
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