These are the real deal! Sanderson Zoomie headers feature the patented leak-free flange and include bolt-in baffles that knock the sound level down just enough for street use. If the classic dragster look is desired, these headers provide the look, Sanderson quality, and powerful sound for your vehicle.
- The ZoomieSBC is available for standard and true D-Port (GM ZZ4, ZZ6, etc.) cylinder heads. Please review the “What is a D-Port” information tab before selecting the flange style.
- The ZoomieSBC is available in two hang-down lengths, 16″ and 19″. Please carefully review the “Zoomie Length” information tab before deciding what is best for the vehicle.
- Review the Baffle installation Instructions information tab
- Images may include Zoomie headers for other engine applications
Includes all hardware necessary for installation.
- Engine: Small Block Chevy 265-400
- Primary Tube Diameter: 1-7/8″
- 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
- (8) Baffle Inserts
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.
What is a D-Port?
This article was provided by Sam of Century Performance Center, Inc.
We often see confusion in what is considered a D-Port cylinder head for small block Chevrolet engine applications. The problem originates in the technical understanding of what constitutes a true D-PORT versus a D-shape. The D-Port roof extends well above the centerline of the exhaust port, whereas the D-shaped port fits nicely inside what is deemed a standard port dimension. As shown in the graphic below, the d-shape easily fits within the common round or square port flange opening.
Where other header manufacturers use a typical flat header flange and gasket for sealing, the patented raised flange design of the Sanderson Headers requires different flanges for different small block Chevy exhaust port shapes. Other header flanges will often block the top of the exhaust port on D-port heads. When using a Sanderson D-Port flange the port is not blocked. However, using the wrong flange with a Sanderson header may expose open areas that will not seal, creating an exhaust leak.
- Using a D-port flange on a common GM head (standard round, square, or D-shaped port), the header port flange open is larger (taller opening) than the sealing area around the exhaust port (additional details below, comparing two BRODIX Track 1® cylinder heads)
- Using a standard Sanderson header flange on a D-port cylinder head has a similar problem, where the cylinder head exhaust port opening may extend above the raised flange sealing area, again creating the possibility of an exhaust leak.
Here is an example of a small block Chevrolet D-port cylinder head that requires the Sanderson D-Port header flange.
Some Zoomie headers are offered in two lengths, either a standard 16″ (40.64 cm) or a longer 19″ (48.26 cm). It is relatively easy to determine the length needed for the application. To be clear, 99% of all applications will use the standard 16″ length. The longer 19″ version requires a much higher chassis or engine location to allow necessary ground clearance.
To provide a simple example, the header should not hang down below the bottom of the wheel. However, this will vary by the wheel and tire profile. In the graphic below, a low-profile tire provides less ground clearance and therefore the bottom of the header should maintain a higher value from the ground.
Many like to have that scraping-the-ground look on their street rods. However, that sort of look is best suited for trailered show vehicles and not those expected to travel city streets that may include driveways, v-drains or dips, speed bumps, or other hazards that could damage the Zoomie header set.
Zoomie and Chopster Header Baffle Inserts:
Sanderson does NOT provide mounting holes for mounting the muffler baffle inserts due to possible liability issues. Safe installation and proper securing of the insert are the responsibility of the customer or installer.
Baffle Installation Procedure:
- First, make sure the inserts are the correct size for the application. Sanderson’s 1.875″ (1-7/8″) inserts are for small block engine applications, and the 2.250″ (2-1/4″) inserts are for big block engine applications.
- For NEW installations – Notice that one end of each Sanderson muffler insert is partly closed off with a welded washer.
- Use a tape measure to determine the depth of the insert from the end of the tube. Use that measurement to mark the inside of the header tube. The insert depth should be held up slightly from the short-side radius at the lower bend and not bottom out (see image below). Measure the insert depth for every tube.
- Insert the muffler into one of the pipes of the header with the partially closed-off end first. DO NOT FORCE. The insert should be snug, but not too tight.
- There are various methods to secure the insert. Either drill a hole slightly in front of the insert and install a stove bolt and locknut (or use red Loctite); or drill and tap directly into the baffle ring, using a properly sized bolt with a small amount of red Loctite on the bolt threads
- NOTE: Some customers have used sheet metal or self-drilling/tapping screws to hold the mufflers in place, but such screws tend to vibrate loose.
- When the mufflers are securely fitted in all eight pipes, the headers are ready to install on the engine.