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HEDMAN 68126 often ranks as the best header for restored 1955-57 Chevys.
It uses 1.625-inch primaries and a 3-inch collector for smoother exhaust flow.
Match the header to correct Engine Computers for fuel and ignition tuning.
HEDMAN 68126 Benefits for Restored 1955-57 Chevy Passenger Cars
This Hedman 68126 improves midrange power and throttle responsiveness for classic small-block Chevys.
The unit uses 1.625-inch primary tubes, a 3-inch collector, and a metallic-ceramic coating for heat control.
Installers should pair the header with modern Engine Computers or calibrated carburetor jets to realize those gains.
Key product details and what they mean
- Part number: 68126 (HEDMAN Street, Elite HTC series)
- Tube size: 1.625 in primaries; collector: 3 in
- Finish: Metallic-ceramic coated for reduced under-hood heat
- Replacement gasket: 27520
- Price: $574.99 USD; package weight: 32.0 pounds
- Fit type: Vehicle specific (manufacturer provides no public compatibility list)
How will a modern tube header improve torque in my 1955 Chevy?
HEDMAN 68126 improves low-end torque by enhancing exhaust scavenging.
Scavenging (the process where exiting exhaust helps pull fresh exhaust from other cylinders) increases volumetric efficiency.
The 1.625-inch primaries tune flow for midrange punch that suits street-driven Tri-Fives with small-block V8s.
Header fitment, clearance and bolt patterns for 1955-57 Chevy
Fit depends on chassis details, steering geometry, and engine mount location on Tri-Five cars.
Hedman labels the item as vehicle-specific but does not publish a complete compatibility list.
Measure K-member clearance, power-steering box placement, and inner-fender space before ordering this header.
Are frame or steering mods required to fit headers on a 1956 Bel Air?
HEDMAN 68126 requires clearance checks and may need steering link relocation.
Some restorers perform minor inner-fender trimming, steering drop brackets, or K-member adjustments to clear tubes.
Confirm fit by mock-fitting the header against mounts and steering arms; hire a restoration shop for complex alterations.
HEDMAN 68126 Installation, tuning and performance for 55-57 Chevy
Installation requires correct gaskets, proper fasteners, and either carb or ECU calibration for optimal performance.
The Elite HTC 68126 ships in a 9.5 x 46.0 x 18.5 inch box and weighs about 32 pounds packed.
Hedman s metallic-ceramic coating reduces radiant heat and helps protect surrounding wiring and intake components.
What gasket type and torque specs are best for a small-block V8 header?
HEDMAN 68126 accepts replacement gasket 27520 and seals reliably with correct torque procedure.
Use a multi-layer steel header gasket and apply anti-seize on studs to prevent galling during installation.
Follow the engine manufacturer s cylinder-head torque values and tighten in an alternating, center-out pattern to avoid leaks.
Will the 68126 bolt to every SBC head? Verify head flange pattern and engine mounts before purchase; compatibility is not guaranteed.
Does the metallic-ceramic coating matter? Yes; the coating lowers radiant heat and resists corrosion, prolonging finish and component life.
Can I mate the 3-inch collector to stock exhaust? Use reducers or custom adapters when the stock tailpipe is smaller than 3 inches.