Upgrading the exhaust on your Fox Body Mustang? Speed Engineering's 1-5/8" SBF shorty headers are a direct-fit upgrade for 1979–1993 Ford Mustang 5.0L applications — mandrel bent, TIG-welded, and CNC-machined with rectangular ports, merge spikes, and a 2.5" collector. Built from 304 natural stainless steel with zinc header bolts and standard graphite manifold gaskets included.
Features:
- Full 1-5/8" Primary Tubes with Merge Spikes — Sized for improved flow on 5.0L/302 applications
- 1-1/2" x 1-1/4" Rectangular Ports — Matches standard SBF rectangular port cylinder head configurations
- 2.5" Collector with Merge Spikes — Optimized for strong low-to-mid RPM torque
- Shorty Header Design — Improved flow over stock manifolds with a compact, fitment-friendly profile
- Mandrel Bent Tubing — Consistent tube diameter throughout; no crimping, no restriction
- CNC Machined Flanges — Precision fit at the cylinder head for a leak-free seal
- 15-1/8" Center to Center Outer Bolt Holes — Standard SBF bolt spacing for direct fitment verification
- 304 Natural Stainless Steel Construction — Corrosion resistant, heat tolerant, and built to last
- Standard Graphite Manifold Gaskets Included
- 3/8"-16x1" Zinc Header Bolts Included
- Compatible with SBF 5.0L/302 V8 Engines
- V8 Engines Only
Vehicle Applications:
Ford Mustang — Fox Body (RWD)
- 1979 Ford Mustang (RWD) — 5.0L/302 SBF
- 1980 Ford Mustang (RWD) — 5.0L/302 SBF
- 1981 Ford Mustang (RWD) — 5.0L/302 SBF
- 1982 Ford Mustang (RWD) — 5.0L/302 SBF
- 1983 Ford Mustang (RWD) — 5.0L/302 SBF
- 1984 Ford Mustang (RWD) — 5.0L/302 SBF
- 1985 Ford Mustang (RWD) — 5.0L/302 SBF
- 1986 Ford Mustang (RWD) — 5.0L/302 SBF
- 1987 Ford Mustang (RWD) — 5.0L/302 SBF
- 1988 Ford Mustang (RWD) — 5.0L/302 SBF
- 1989 Ford Mustang (RWD) — 5.0L/302 SBF
- 1990 Ford Mustang (RWD) — 5.0L/302 SBF
- 1991 Ford Mustang (RWD) — 5.0L/302 SBF
- 1992 Ford Mustang (RWD) — 5.0L/302 SBF
- 1993 Ford Mustang (RWD) — 5.0L/302 SBF
FAQ
What port shape do these headers use?
These headers use 1-1/2" x 1-1/4" rectangular ports, compatible with standard SBF rectangular port cylinder head configurations on the 5.0L/302 Fox Body Mustang.
What is the collector size on these headers?
These headers feature a 2.5" collector with merge spikes.
What is the bolt hole spacing on these headers?
The outer bolt holes are 15-1/8" center to center, matching standard SBF head bolt spacing.
What bolts are included?
3/8"-16x1" zinc header bolts are included with the headers.
What is the difference between these headers and the 1964–1977 SBF shorty headers (25-1240)?
Part 25-1239 is a direct-fit shorty header specifically designed for the 1979–1993 Fox Body Mustang 5.0L/302. Part 25-1240 covers the classic 1964–1977 Mustang, Maverick, Fairlane, Falcon, and Mercury Cougar SBF applications. Both feature rectangular ports and merge spikes but are engineered for different chassis configurations.
What material are these headers made from?
304 natural stainless steel with full TIG-welded construction, CNC-machined flanges, and merge spikes.
Are gaskets included?
Yes. Standard graphite manifold gaskets are included with the headers.
Are these headers street legal?
No. These are race-only headers intended for closed-course competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).
⚠️ Race Use Only: This product is manufactured and sold for installation on vehicles used solely for competition. Once installed, the vehicle may not be used, registered, or licensed for use on a public road or highway. Installation on a street-driven vehicle may violate the Clean Air Act 203(a)(3), 42 U.S.C. 7522(a)(3).