70-73 Mustang 351 Long Tube Headers

The 70-73 Mustang 351 Long Tube Headers from Hedman (MPN 88326) are purpose-built exhaust manifolds engineered to unlock the breathing potential of first-generation Fox body and early classic Mustangs equipped with the legendary 351 Cleveland engine. Long-tube headers are essential for enthusiasts seeking maximum scavenging efficiency, as they replace restrictive factory manifolds with tuned primary runners that optimize exhaust pulse timing and cylinder evacuation. These headers are ideal for street machines, weekend warriors, and restomod builds where you want genuine horsepower gains without full race-car complexity.

Hedman engineers these long-tube headers with 1.625-inch primary tubes and a 3-inch collector, a proven combination for the 351 Cleveland block that balances low-to-mid-range torque with upper-RPM flow. The steel construction is finished in silver ceramic coating, which reduces underhood heat by reflecting radiant energy while protecting the headers from rust and thermal fatigue—critical for longevity in street applications. At 26 lbs per pair, they're substantial enough to handle sustained heat cycles, and the included gaskets and mounting hardware eliminate guesswork during installation. This ceramic finish also preserves the headers' appearance, keeping them show-ready while delivering real thermal performance.

Owners of 1970–1973 Mustangs with 351 Cleveland or modified Ford engines benefit most from these headers when paired with a quality exhaust system and intake tuning, where the scavenging effect compounds to deliver 15–25 hp gains on the dyno. Installation requires basic hand tools and approximately 3–4 hours of undercarriage work; long-tube design may necessitate minor heat shielding or routing around transmission cooler lines, depending on your specific year and drivetrain. These headers are SAE-certified for street use and are a proven choice for restomod builders and enthusiasts serious about restoring lost performance to classic Mustang platforms.