Know the landed cost before you order
Prices include VAT. Shipping is charged separately and calculated at checkout for your destination. If no shipping option is shown, contact us for a quote before ordering.
A proper exhaust for your Windsor build
Give your 351 conversion a header made for its cylinder heads and chassis. Kooks 10252650 has 2-inch primaries, 3-1/2-inch collectors and a 3-inch inline bolt pattern at stock port height, for the specified 9.5-inch-deck Windsor installation.
SKU: 10252650
Match the head pattern
These headers suit the specified Dart / World 210 / 225 and Pro Topline heads. Gaskets and bolts are included with the 16-gauge 304 stainless headers. That head pattern is the essential difference from the diagonal-pattern version.
Plan the conversion parts together
Use a UPR or BMR Standard tubular K-member, Powermaster 9503 starter and Flaming River steering shaft. A Stifflers transmission crossmember is recommended. Engine mounting and lowering affect clearance; shims may be required to position the engine correctly.
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 | 10252650 | 351W 9.5-inch-deck conversion; 3-inch inline stock-port-height specified heads; required chassis parts detailed in copy |
| 1979-1986 | Mercury Capri | Installed 351 Windsor, 9.5-inch deck | 10252650 | 351W 9.5-inch-deck conversion; 3-inch inline stock-port-height specified heads; required chassis parts detailed in copy |
Intended use
10252650: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 10252650.
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 | 10252650 |
| Application | 1979-1993 Ford Mustang / 1979-1986 Mercury Capri engine conversion |
| Engine / deck height | 351 Windsor; 9.5-inch deck |
| Header primary diameter | 2-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
Do these fit the diagonal Trick Flow head pattern?
10252650 is the 3-inch inline, stock-port-height version. The diagonal-pattern product is a separate choice for the specified heads.
Would 1-7/8-inch primaries suit my engine better?
That depends on the engine specification and intended use. We can help you compare the matching inline-pattern sizes before you order.
