Ford Authority

1967 Ford Mustang GT With 428 Cobra Jet Swap Hits The Dyno: Video

For the most part, we look upon the golden muscle car era of the 1960s and early 1970s as a glorious time for horsepower, with a wide variety of amazing, track-ready vehicles available to purchase straight off the dealer lot. In reality, however, those vehicles pale in comparison to today’s muscle cars, at least in terms of sheer output, even if they may not necessarily be as “cool” as their predecessors. Case in point – this amazing restored 1967 Ford Mustang GT owned by Scott Hubbard, which has been treated to a 428 Cobra Jet swap.

In this video from Late Model Restoration, Hubbard brings his 1967 Ford Mustang GT out for a little dyno testing to see just how much power it can lay down with its new engine. This particular fastback is an original S-Code 390 with a four-speed manual that Hubbard bought when he was a mere 15 years old way back in 1979. He proceeded to restore it in the mid-1980s, and has accumulated 38k miles on the car since then, bringing its total to around 138k.

During that process, Hubbard ditched the original 390 and replaced it with the 428 Cobra Jet V8, which has been bored 0.030″ over and treated to some modifications including Edelbrock aluminum heads, roller rockers, a Pertronix pointless ignition, a Ford medium riser Police Interceptor aluminum Intake, 428 CJ exhaust manifolds, and a Holley four-barrel 750 cfm carb, though it’s still running the stock cam. That powerplant is now mated to a T45 five-speed manual transmission and a 9-inch rear end with 3.00 gears.

On 93-octane fuel, that rather modest combination laid down an also modest 265 horsepower at the wheels, though a more impressive torque figure of 372 pound-feet of torque. Obviously, those numbers won’t light anyone’s hair on fire and pale in comparison to a newer Mustang, but few – if any – look or sound as cool as this vintage pony car.

We’ll have more cool videos like this to share soon, so be sure and subscribe to Ford Authority for the latest Ford Mustang news and continuous Ford news.

Brett's lost track of all the Fords he's owned over the years and how much he's spent modifying them, but his current money pits include an S550 Mustang and 13th gen F-150.

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  1. Craig Contofalsky

    That engine is a real slug? I raced back in the early 70’s and those 428 CJ’s were fast and made lots more power. Quite capable of low 13’s if driven properly. John Kasee raced at our track, Dragway 42 in West Salem, Ohio. He now builds extremely large BB Ford engines.

  2. Dale

    If that’s all they have is 265 hp at the rear tires they should remove the white racing stripes.

  3. Roy A Richards

    I have 1992 Ranger with a 5.0 and 5 speed out of a 92 Mustang that has ported trick flow heads and intake that layed down 252 hp and 282 lb.ft. torque with stock short block. That 428 is extremely anemic.

    1. Jareth Gilliam

      It’s gotta be an ignition issue or it’s absolutely choked after 3k rpm. The 428 CJ is no slouch

  4. Grape Ape

    2015 6.2 LS 365 HP 385 ft-lb at the rear wheels, auto transmission has some parasitic loss, about 445 HP and 465 ft-lb at the crank. The car flies imo.


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