The DD4 header fits Dodge 241-325 Hemi V8 engines in Model A and later chassis that do not have a cross member directly under the center of the engine. The DD4 drops straight down, and the collector is tight to the oil pan. If unsure of which engine you have, the Dodge Hemi and DD4 bolt pattern should measure 14-3/8″ center-to-center of the outer flange bolts (see image). The DD4 is compatible with most steering setups.
NOTE: For cylinder heads with 14¾” spacing (DeSoto Hemi engines), order part number DD5
Includes all hardware necessary for installation.
Engine: Dodge 241, 270, 315, and 325 Hemi V8
Primary Tube Diameter: 1-1/2″
Collector Diameter: 2.5″
- 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
- Header Bolt Set
- Collector Reducer Set
Our Ceramic Coating is recommended for every vehicle application and is the default finish selection choice above. To meet high standards of quality, We apply a multi-layer inside and outside aluminized ceramic coating in-house and then polish 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.
Hemi Engine History
It is important for us to know which Hemi engine is in your vehicle because there is more than one. (This article is provided by Sam of Century Performance Center, Inc.)
First, Some History:
Although it was Chrysler who trademarked the term “Hemi” somewhere within the 1950s, it wasn’t until the second generation Hemi, the 426 that showed up in 1964 that Chrysler started using it to officially define the engine’s name. The name originates from the hemispherical cylinder head and more specifically, the combustion chamber design. The 426 Hemi, often referred to as the “elephant”, became well-known quickly for its use in NASCAR and a few special production vehicle applications. The trademarked name was not officially recognized from a commerce standpoint until February of 1966, 2 years after virtually everyone knew something about it.
However, while most people immediately recognize the term “426 Hemi”, it was not the first Hemi engine. The Chrysler FirePower (not yet coined as a Hemi) 331 V8 was the first, finding itself between the fenders of a few 1951 model year vehicles. And there were others … which gets us here.
Each Hemi engine group uses a different exhaust port and bolt spacing. Therefore, Sanderson headers for the Hemi engines vary slightly to include specific flanges for the port and bolt layout and varying primary tube bend radiuses to accommodate different exhaust port exit angles. Here are the four Hemi engine groups that Sanderson builds headers for. You will see in the list below that the Dodge and Desoto Hemi engines include a dimension. This is the easiest way to determine the difference between those two engine groups. Please refer to the graphics below the list to explain this dimension.
NOTE: Sanderson is not currently offering header sets for late model 5.7L, 6.1L, 6.2L, and 6.4L engines.
- Chrysler 426 Hemi
- Chrysler/Imperial FirePower 331-392 (331, 354, 392)
- Dodge 241-325 (14-3/8″) (241, 270, 315, 325)
- DeSoto 276-345 (14-3/4″) (276, 291, 330, 345)
This first graphic shows the 14-3/8″ spacing for Dodge Hemi engines.
This second graphic shows the 14-3/4″ dimension of the DeSoto Hemi engines.
If you have any questions regarding the proper engine group or flange selection, please reach out to us by phone or through our Helpdesk.