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1969 Ford Mustang BOSS 520: What This Custom 520-Cubic-Inch Build Really Is

The V8 Werk 1969 Mustang BOSS 520 is a custom fastback with a listed 520-cubic-inch Jon Kaase V8—not a factory Boss model. Its stated 900 PS output lacks a documented measurement basis.
Entry154 Date Time2 min MechanicCarCody Team
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The 1969 Ford Mustang BOSS 520 is a bespoke fastback, not a factory Ford trim. V8 Werk describes a restoration completed from 2016 to 2022, powered by a fuel-injected 520-cubic-inch Jon Kaase V8 and lists its output as 900 PS. That figure is the builder page’s specification; it does not explain whether it came from a dyno test, an engine rating, or an estimate.

Was the 1969 Mustang BOSS 520 a factory model?

No. The car documented by V8 Werk is a custom build, not a factory 1969 Boss 520 model. The First Mustang Club of Germany’s history page describes the factory Boss models as the 4.9-liter Boss 302 and the 7.03-liter Boss 429; it does not list a Boss 520. That club history is useful context, though it is not a substitute for Ford archival records.

“Boss 520” is used for custom Mustangs with 520-cubic-inch engines, and it does not identify one standardized specification. A separate 1967 Boss 520 build covered by MotorTrend and the Ringbrothers 1969 Mustang Mach 1 UNKL covered by The Drive are different cars.

What engine and power does the V8 Werk car have?

Engine

V8 Werk lists an 8.5-liter (520-cubic-inch) Jon Kaase V8 with fuel injection. The page identifies the car as a fastback and says its restoration ran from 2016 through 2022.

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#1 Best Overall
AMT 1969 Ford Mustang Mach I John Wick 1:25 Scale Model Kit
  • 1:25 scale, skill level 2, paint & glue required 169 parts Molded in white, clear and transparent red, with chrome-plated parts. Black vinyl tires Metal axle Built size: 7.125 inches long Ages 10+

Power figure

V8 Werk lists output as 900 PS, but gives no measurement method or supporting dyno record. Treat it as the page’s stated specification, not as an independently verified result. It should not be conflated with the 700 horsepower reported by The Drive in 2019 for the separate Ringbrothers 1969 Mach 1 UNKL, or the 785 horsepower and 705 lb-ft reported by MotorTrend in 2017 for a different 1967 Boss 520.

What else is modified?

V8 Werk’s specification describes a heavily altered car rather than a stock Mustang. Its listed equipment includes:

Rank #2
'69 Boss 302 Mustang
  • 1: 25 scale/ 109 parts
  • Detailed 302 cu. In. V-8 engine
  • Front and rear spoilers
  • Tampo printed tires
  • Molded in white, transparent red and clear with chrome plated parts and soft black tires
  • A six-speed manual transmission.
  • A Chassisworks front clip and push-rod rear arrangement.
  • Wilwood six-piston front and four-piston rear brakes.
  • Rack steering with electric assist and a hand-built stainless-steel exhaust.
  • 18-inch American Racing Torq Thrust II wheels.
  • A custom leather and Alcantara interior, air conditioning, electric windows, a roll bar with front four-point belts, and a multimedia system.

The exterior is described as Acapulco Blue with white stripes in a 1970 Boss 302 style. These details are V8 Werk’s published claims; independent build records confirming each specification were not located.

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Does “ultimate Mustang” mean it is objectively the best?

“Ultimate” works as a description of the build’s ambition: a classic fastback paired with a large fuel-injected V8 and substantial chassis, brake, and interior changes. It is not an established performance ranking. No comparable road-test, acceleration, braking, or lap-time results are available for this particular car, so the published specifications alone cannot show how it performs against other high-powered Mustangs.

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Rank #3
TOKAXI 1/36 Scale 1969 Ford Mustang Boss 429 Diecast Model Cars,Pull Back Vehicles Boss 429 Mustang Toy Cars,Cars Gifts for Boys Girls
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The car’s VIN-linked provenance and original build documentation have not been established in the cited material. For a definitive account of its history or the basis for the 900 PS figure, the useful evidence would be the build records and a documented dyno test.

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Greenlight Collectibles 1:64 Scale 30557-1:64 John Wick 1969 Mustang BOSS 429 - Silver Chrome Edition
  • OFFICIAL JOHN WICK COLLECTIBLE: This diecast vehicle is a hobby exclusive release based on the iconic 1969 Ford Mustang Boss 429 featured in the John Wick movie.
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LUPPA Classic 1:43 American Mach Coupe 1969 Diecast Car - Collectible Legendary Vintage Model with Display Base & Precisely Crafted for True Collectors
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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