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Hedman Performance Parts
Hedman 66391
Hedman 66391 HTC Coated Hedders 600x501
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Hedman 66391
• 18 gauge mandrel bent primary tubes
• ¼" flanges to resist warpage
• Hedman has designed the 66391 for a perfect fit
• Includes hardware and gaskets
• Durable aerospace coating insulates and protects from corrosion
• Keeps heat inside header tubes where it belongs
• Backed by a lifetime warranty
• Proud to say made in the USA since 1954

Not legal for sale or use on pollution controlled motor vehicles.
Our Price: $569.95
UPC 732611663915
Free Shipping and Handling for orders over $99!
(US only. Excluding any oversize charges.)
Enter Zip Code to Calculate Estimated Delivery Date
1Estimated Shipping Dates are based on available inventory and the nearest warehouse.
Performance Parts is a Hedman authorized performance retailer
Product Info Related Items
Hedman 66391 HTC Coated Exhaust Headers
Fits 1988-1995, Chevrolet and GMC pick-ups with 7.4L engine and 4 wheel drive
(Late model chassis. Engine offset to passenger side of vehicle.)

Hedman standard duty 66391 headers for GM pick-ups are available from the factory with Hedman's own exclusive "HTC" Ceramic-Metallic thermal protection coating. This is an extremely durable coating that was developed by the aerospace industry and pioneered for use in automotive applications by the engineers at Hedman Hedders. It greatly improves not only the lifespan of your Hedman headers but also their function. It resists corrosion from moisture, road salts, and oxidation, and shields against heat up to 1,400 degrees! This helps to keep the exhaust heat inside the headers where it belongs, which not only speeds up the flow but protects underhood components from damage due to excessive heat.

Hedman's 66391 header is superior to your pick-up's factory cast iron exhaust manifold, with its short cramped design that restricts exhaust flow. Your Hedman Hedders feature smoothly bent individual pipes that help to pull the exhaust gases out of each cylinder. Hedman's 66391 exhaust header has been designed specifically for your truck and will fit and perform better than any other exhaust header you can buy.

Tube diameter: 1-3/4"
Collector: 3"
Full length headers
Some applications may require notching the flanges for head bolt clearance
Shipping Weight/Dimensions:
Weight:31.00 lbs
Height:8.00 in.
Length:39.00 in.
Width:16.50 in.
Shipping from warehouses in the U.S. and Canada!
Performance Parts has over 20 warehouses in the U.S. and Canada so you can get your parts duty free! Call for availability.
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- Last Updated: 2016-01-07 15:16:50 -
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