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Match your 351 headers to the heads you have chosen
Cylinder-head choice matters on a serious Windsor build. These Kooks headers pair 2-inch primaries with 3-1/2-inch collectors and a 2-3/4-inch diagonal bolt pattern for the specified 9.5-inch-deck 351 conversion.
SKU: 10242650
For the diagonal head pattern
10242650 is for Trick Flow High Port / Street Heat or new-style Brodix Track 1 heads. The 16-gauge 304 stainless construction comes with header gaskets and bolts, giving your installer the matched header parts. The flanges are 3/8-inch thick, giving your installer the specified head mounting interface.
Make room under your Mustang
A UPR or BMR Standard tubular K-member, Powermaster 9503 starter and Flaming River steering shaft are required. A Stifflers crossmember is recommended. Engine position and lowering affect the ground clearance; mount shims may be necessary.
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 | 10242650 | 351W 9.5-inch-deck conversion; 2-3/4-inch diagonal specified heads; required chassis parts detailed in copy |
| 1979-1986 | Mercury Capri | Installed 351 Windsor, 9.5-inch deck | 10242650 | 351W 9.5-inch-deck conversion; 2-3/4-inch diagonal specified heads; required chassis parts detailed in copy |
Intended use
10242650: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 10242650.
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 | 10242650 |
| 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 | 2-3/4-inch diagonal |
| Cylinder heads | Trick Flow High Port / Street Heat and Brodix Track 1 new-style |
| 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 |
| Flange thickness | 3/8-inch |
| Material | 304 stainless steel |
Frequently asked questions
How does this differ from the inline version?
10242650 has a 2-3/4-inch diagonal head bolt pattern. The inline version is for a different head pattern, so choose by the actual heads rather than primary size alone.
Are the conversion chassis parts supplied?
The required K-member, starter and steering shaft are separate. Header gaskets and bolts are included.
