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Sanderson CAD390 Header Set for Cadillac 390/429 Engines in 66 Coupe DeVille and Street Rods


The Sanderson CAD390 header fits Cadillac 390/429 engines in 1966 Coupe DeVille and Street Rod applications.

SKU: SDH-CAD390 Category:
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Sanderson's patented flange design requires no gaskets

The Sanderson CAD390 header fits 390/429 Cadillac engines in 1966 Coupe DeVille and other street rod and classic truck applications. Featuring a 3-tube design, the outer primary tubes are 1-5/8″ diameter, while the center (or inner) tube is 1-7/8″ diameter, and then exiting through a 2½” collector.

Does not include header bolts. ARP Part # 4AP1.00-5C recommended and sold separately.


Engine : Cadillac 390/429 V8
Primary Tube Diameter : 1-5/8″ outer, and 1-7/8″ inner
Collector Diameter : 2½”
Weight : 18 LBS / 8.16 KGS


  • 16-Gauge Primary and Collector Tube Thickness
  • 3/8″ Thick Flange
  • Patented Flange Design Requires NO Gaskets
  • Tightest Fitting Header Available Anywhere!
  • Made in the USA


Sanderson’s Ceramic Coating is recommended for every vehicle application and is the default finish selection choice above. To meet high standards of quality, Sanderson applies a multi-layer inside and outside aluminized ceramic coating in-house and then polishes the coating to a high luster. This aerospace and military-grade technology adds excellent protection to your headers, while offering the benefit of thermal control in your engine bay. It also improves cylinder scavenging of exhaust gases, and increases the longevity of your header investment.


Sanderson Headers

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When sitting in driver’s seat and engine in front of you, the LEFT header would be the Driver’s Side on LH drive vehicles; coincidentally, means the RIGHT header is on the passenger side.

 NOTE: Image graphic is generic and not exact representation of product.

Tube Size 1-5/8″ & 1-7/8″
Collector Size 2½”
DIM A 4.0″ 3½”
DIM B 13½” 4½”
DIM C —- 26¼”
Weight (Lbs / Kg) 20 / 9.07
Sanderson full length header dimension graphic

NOTE: Outer tubes = 1-5/8″ diameter; Inner (center) tube = 1-7/8″ diameter


Vehicle Applications



1965-1970 Cadillac Coupe de Ville Stock All

CS = Standard Cross Steer; RP = Rack & Pinion

Engine Applications:

  • Cadillac 390/429 OHV V8

Install Notes

Header Bolts:

Does not include header bolts. ARP Part # 4AP1.00-5C is recommended


  1. The Patented Leak-Free Design that Sanderson Headers offer you is the only leak-free flange design on the market … Do Not Attempt To Use Flange Gaskets! The raised flange on the Sanderson Headers will buckle the gasket during tightening and actually cause a leak! Click here for installation procedure.
  2. Sanderson Headers are NOT emissions legal on pollution-controlled motor vehicles. It is the purchaser’s responsibility to verify local regulations for compliance.
  3. Wrapping your Sanderson Headers with ANY thermal tape voids your header warranty. The best thermal protection for your headers is our Aluminized Ceramic Coating that is available for every Sanderson Header. Please read our tech article that thermal coatings and header wraps.


Sanderson 5-Yr Header WarrantyLimited 5 Year General Warranty

Sanderson Street Rod Headers strives to supply our customers with the highest quality parts and service available in the street rod industry. In keeping with this, we warrant and will repair or replace, at our option after inspection in our facility, any of our products which are found by us to have failed due to defects in either material or workmanship.  This warranty is activated by the return of the Warranty Card enclosed with every pair of headers, and is effective for FIVE YEARS * from the date of purchase as indicated on the original invoice.

This Warranty does not cover products that fail due to improper motor tuning, alteration, disassembly, or damage caused by racing, misuse, neglect, abuse, improper installation and/or accident, or when used on applications for which they were not designed or approved. We are specifically not responsible for the costs of removal, installation, transportation, destruction of other components, inconvenience, loss of time, or other personal damages, or for any other associated costs including the application of aftermarket coatings applied by others. Sanderson Street Rod headers shall not be liable for any and all consequential damages occasioned by the breach of any written or implied warranty pertaining to this sale in excess of the purchase price of the product(s) as found on the original invoice.


* Extremely compact header designs which locate the collector in close proximity to the exhaust ports are very sensitive to engine tuning. Improper air/fuel mix or timing of ignition and/or valvetrain can cause early failure due to excessive heat. For this reason, part numbers CC2 and CC3 are offered with a two-year Warranty period only. All other Warranty conditions apply.

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