FF6 Header Set, Small Block Ford 221-351w


The FF6 header set fits small block Ford 221-302, 351W engines in Ford Fairlane, and other Ford compact applications.

Sanderson FF6 header set
FF6 Header Set, Small Block Ford 221-351w $446.67$679.72

Sanderson Headers - No Gaskets

The FF6 small block Ford header set fits Ford Fairlane and similar Ford compact applications. The FF6 fits inside stock shock towers and is compatible with factory steering.

The FF6 also fits some Falcon applications. Although it is often best to use the FF3GTS on most Falcon chassis, there are some applications that benefit from the FF6.

  • The FF6 is compatible with GT40-P cylinder heads!
  • Be sure to select the correct engine group (221-302 vs. 351w) when ordering.
  • Please select the correct transmission. 221-302 AOD applications require a special passenger side header.
  • Please Review the “SB Ford Flanges” information tab.

Includes all hardware necessary for installation.


Engine: Small Block Ford 221-302, 351W V8
Primary Tube Diameter: 1½”
Collector Diameter: 2½”


  • 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.

Additional information

Weight17 lbs
Dimensions20 × 12 × 8 in
Header Finish

Silver Ceramic Coated, Black Satin Ceramic Coated, Plain Steel (raw metal)

SBF Engine Group

221-302, 5.0L, 351W

Ford Transmission

C4/C6, or Manual, AOD / AOD-E / 4R70 / 4R75


Sanderson FF6 dimension graphic

SB Ford Flanges

We offer three primary header flange styles for small block Ford engines—the standard rectangular flange, and two square port flanges. The square port flange choices are based on the mounting bolt spacing. Some small block Ford cylinder heads use either a 2.0″ or 3.0″ spacing  Some include both mounting holes.

A fourth flange style is available on some header sets for the Roush-style SB 427 cylinder heads. Although this is a 3.0″ bolt spacing flange it includes substantial modification in an attempt to allow spark plug clearance. This is not a common flange design. The Roush heads present a problem due to the spark plug locations and angles. To oversimply the problem, these heads are really NOT compatible with thick 3/8″ or larger flanges!

Many aftermarket cylinder head manufacturers now use the square port shape on their products. However, that does not mean the square flange is required. The importance here is to ensure the header flange properly seals to the cylinder head. In most cases, the standard rectangular shape works perfectly, but on other heads, the square port flange is necessary. It is the customer’s responsibility to decide the correct flange for their application.

NOTE: Extra charges are incurred for headers built with the square port flange due to the additional manufacturing time required.

Below are two images showing the differences between the rectangular vs. square flange styles. The square flange provided utilizes the 2.0″: bolt spacing. Please use these images and the provided dimensions to ensure the proper flange is selected for your new Sanderson Headers from the drop-down menu on the product details.

Installation Notes

  1. The Patented Leak-Free Design on Sanderson Headers provides the only leak-free flange design on the market … Do Not Attempt To Use Flange Gaskets! The raised flange on tube-style Sanderson Headers will buckle the gasket during tightening and actually cause a leak!  It is only OK to use a header gasket on the cast-series header sets (QP1000 and QP2000) Click here for the header 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 which is available for every Sanderson Header. For additional information on why using header wraps is a problem, please read this tech article by Century Performance Center which addresses thermal coatings and header wraps.

Header Warranty

Sanderson Header WarrantyLimited 5-Year General Warranty

Sanderson Street Rod Headers strives to supply our customers with the highest quality parts and services available in the street rod industry. In keeping with this, we warrant and will repair or replace, at our option after an inspection in our facility, any of our products that 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 that 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. This includes header sets that utilize one of these headers as part of the set (part numbers CC4 and CC14 for example). The compact header side will hold a 2-year warranty. All other Warranty conditions apply.

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