Made in USA
Standard Duty HTC Coated Full-Length Headers 1967-86 GM K-Series Truck/SUV 283-400
InfoVehicle Info Needed
HEDMANPART NUMBER: 500-66237

Standard Duty HTC Coated Full-Length Headers 1967-86 GM K-Series Truck/SUV 283-400

$51299
ShippingShips on Sep 08, 2026
Lowest PriceLowest Price Guarantee

GM Trucks
    Standard Duty HTC Coated Full-Length Headers
  • 1967-86 GM K-Series Truck/SUV 283-400
  • 1-5/8" Tube, 3" Collector

  • Vehicles equipped with large piston AC compressors require the use of bracket #500-20110
  • Without smog injection or injection heads
  • Must modify rotary A/C bracket
  • Includes parts necessary to retain emission devices (50-state legal for 1975-81 only)
  • Some vehicles may encounter clutch shaft interference when cross shaft location is located under or behind the driver's side rear exhaust port. Use #500-69092 without A.I.R. Use #500-69093 with A.I.R.
  • Modification to stock exhaust required to retain catalytic converter
  • For 1964-74 vehicles without A.I.R. system (considered OE replacement when existing emission controls are not removed from vehicle)
  • EO#D167-27

Hedman Hedders has been manufacturing quality headers in the USA since 1954, and they've been manufacturing long and MID-LENGTH tube headers for Pontiac models for decades. 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 vehicle's exhaust system to bolt up, even if it is not perfectly aligned with the header collectors.

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These headers have a high temperature POLISHED-SILVER ceramic finish that resists corrosion, and can withstand temperatures up to 1400 degree F. Each set includes a pair of header 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.

Made in the USA

Features:

  • Coating offers protection up to 1400°.
  • Won't chip, peel, or "blue" like chrome.
  • Superior heat insulation.
  • Increased exhaust velocity for more power.

NOTE: Installing coated headers on an engine during the break-in period will cause discoloration. The use of factory manifolds or an old set of headers is recommended while breaking in an engine.

Part TypeHeader
Product LineHedman HTC Hi-Tech Coated Headers
BrandHEDMAN
Package Height8.25
Package Width16.5
Package Length29.0
Weight23.0 PG
Part CategoryPerformance Parts
Carb Eo NumberD-167-26 (pdf)
Header FinishSilver ceramic coated
Tube DirectionDown Swept
QuantitySold as a pair
Bolts/Studs IncludedYes
Transmission Mount IncludedNo
Header MaterialSteel
Gaskets IncludedYes
Weld-UpNo
Collector AttachmentBall and socket flange
Flange StyleStandard
TunedNo
Collector Diameter3 in (76.2 mm)
Motor Mounts IncludedNo
Part FitmentSemi Universal
Reducers IncludedYes
ApplicationAutomotive
Primary Tube Gauge18-gauge
Header StyleFull-length
Cross Over Pipe IncludedNo
Catalytic Converter(S) IncludedNo
Primary Tube Diameter1.625 in (41.3 mm)
Vendor Part Number66237
Package Qty1
Package TypeEA
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