How much horsepower does a 428 Thunderbird have?
The 428-cubic-inch V8 in Ford Thunderbird models from the mid-1960s typically delivered in the mid-300s horsepower, with factory figures commonly cited around 345 hp and occasional high-output configurations approaching 360 hp. Exact numbers vary by year, trim, and rating method.
Context: The 428 V8 in the Thunderbird lineage
Ford offered the 428 cubic-inch V8 as an optional engine in mid-1960s Thunderbirds, delivering strong performance for a luxury coupe of that era. Power ratings from the period use the gross horsepower standard, which differs from modern net horsepower measurements.
Horsepower by configuration and year
Before examining the numbers, note that horsepower for the 428 in Thunderbirds varied by year and specific setup. The values below reflect typical factory figures published in the era.
- 1965–1967 Thunderbird with the 428 four-barrel V8: approximately 345 horsepower (gross) and about 450–460 lb-ft of torque, depending on the exact configuration and carburetion.
- Higher-output 428 variants used in parts of the Ford lineup could reach roughly 360 horsepower (gross) in certain configurations, though this depended on calibration and options.
Concluding: For a stock 428 Thunderbird in its original form, expect horsepower in the mid-300s, with some variants offering slightly higher figures. The precise number depends on year, equipment, and how the rating was measured at the time.
Rating systems and how to verify
Remember that 1960s horsepower ratings were gross figures measured under specific test conditions. Modern net horsepower numbers account for drivetrain losses and accessories. If you need an exact figure for a particular car, consult the original build sheet, dealer literature, or a factory specification sheet; for practical results, a controlled dyno test on the finished engine will provide real-world output.
Summary
The 428 V8 in a Ford Thunderbird generally produced about 345 horsepower in standard 4-barrel form, with certain high-output configurations approaching 360 horsepower. Exact figures vary by year and equipment, and vintage ratings differ from modern measurements. For precise numbers on a specific vehicle, reference period documentation or perform a dyno test.
How much horsepower does a 1966 Thunderbird 428 have?
345 hp
For 1966, the 390-cubic-inch V8's power was increased to 315 hp (235 kW). The larger 428-cubic-inch (7.0 L) V-8 became optional, rated at 345 hp (257 kW) and providing a notable improvement in 0-60 mph acceleration to about 9 seconds.
Was the Ford 428 a good engine?
It would be the 428 big block, however, that capped the FE's high horsepower era on the street, living alongside the 385-series engines that eventually replaced it and winning significant respect among muscle car fans.
What was the actual horsepower of a 428 cobra jet?
The 428 Cobra Jet engine was officially rated at 335 horsepower, but this was an understatement used to appease insurance companies and meet drag strip regulations. In reality, the engine's true horsepower was widely believed to be over 400 hp, with dyno tests showing figures around 365 to 375 hp in stock form, and even higher when equipped with headers.
You can watch this video to learn about the 428 Cobra Jet engine's history and performance: 59sIts Just Cars!YouTube · May 7, 2024
- Officially advertised: 335335335 hp
- Estimated real-world horsepower: Exceeding 400400400 hp
- Dyno-tested (stock): Around 365365365 hp to 375375375 hp after break-in
- With headers: Potentially over 400400400 hp
- Torque: Officially 440440440 lb-ft, with some tests showing slightly higher figures as well
How much is a 428 cobra jet engine worth today?
A Beautifully Detailed, Complete 428 Cobra Jet Engine with an Automatic Flexplate is $22,250.
