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Give your 351 Windsor the headers it needs
A 351-powered Fox Mustang is about the engine as much as the car. These Kooks headers are built around a 9.5-inch-deck Windsor with the correct aftermarket heads, using 1-7/8-inch primaries and 3-1/2-inch collectors for a properly matched conversion.
SKU: 10252450
Match the cylinder heads first
10252450 uses a 3-inch inline bolt pattern at stock port height, for the specified Dart / World 210 / 225 or Pro Topline heads. This is a head-pattern choice as well as a tube-size choice. The 16-gauge 304 stainless headers include gaskets and bolts.
Make room for the conversion
A UPR or BMR Standard tubular K-member, Powermaster 9503 starter and Flaming River steering shaft are required. A Stifflers transmission crossmember is recommended. Engine mounting position and lowering affect ground clearance; mount shims may be needed to achieve the right clearance.
Tuning for your exhaust upgrade
We recommend tuning with every header installation so the calibration suits your headers, complete exhaust and fuel. Talk to us to discuss tuning for your vehicle and the parts you are fitting.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 1979-1993 | Ford Mustang | Installed 351 Windsor, 9.5-inch deck | 10252450 | 351W 9.5-inch-deck conversion; 3-inch inline stock-port-height heads; required K-member, starter and steering shaft detailed in copy |
| 1979-1986 | Mercury Capri | Installed 351 Windsor, 9.5-inch deck | 10252450 | 351W 9.5-inch-deck conversion; 3-inch inline stock-port-height heads; required K-member, starter and steering shaft detailed in copy |
Intended use
10252450: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 10252450.
Ordering and delivery
Estimated lead time is 4-6 weeks. Delivery may be faster depending on stock levels. Shipping is charged separately.
Technical specifications
| Specification | Details |
|---|---|
| SKU | 10252450 |
| Application | 1979-1993 Ford Mustang / 1979-1986 Mercury Capri engine conversion |
| Engine / deck height | 351 Windsor; 9.5-inch deck |
| Header primary diameter | 1-7/8-inch |
| Collector diameter | 3-1/2-inch |
| Header bolt pattern | 3-inch inline; stock port height |
| Cylinder heads | Dart / World 210 / 225 and Pro Topline |
| Construction | 16-gauge tubing |
| Included | Header gaskets and bolts |
| Required chassis parts | UPR or BMR Standard tubular K-member, Powermaster 9503 starter and Flaming River steering shaft |
| Recommended crossmember | Stifflers transmission crossmember |
| Ground clearance | Affected by engine mounting position and lowering; mount shims may be required |
| Material | 304 stainless steel |
Frequently asked questions
Are these for a stock-cylinder-head 351?
The required head pattern is 3-inch inline at stock port height, with the specified aftermarket heads. Match the head model and bolt spacing before choosing 10252450.
What chassis parts are required?
Plan for the UPR or BMR Standard tubular K-member, Powermaster 9503 starter and Flaming River steering shaft, purchased separately. The Stifflers crossmember is recommended.
