Mustang Cobra Jet Pins and Buttons

The 429 was NOT simply a 1 (or 2) cubic inch larger version of the blue oval 427 & 428 engines. It was a totally new engine from a different engine family. This design was a departure from the paradigm, utilizing thin-wall casting methods and a skirtless block to reduce weight. The Super Cobra Jet, rated at 375 HP, had a 4-bolt main block, a Holley 780 cfm 4BBL carburetor, and a larger mechanical camshaft. It was only available with a 3.91 or 4.30 rear axle ratio. In 1971, the CJ engine also used a 4-bolt main block. However, these engines were actually derated and produced power in the 440–460 HP range. This was done to deceive insurance companies (common practice in that era), so that buyers did not have to pay higher insurance rates.

It doesn’t get sweeter than this!

With it's 428 cubic inch 7 litre engine producing 340 horsepower as standard, the 1969 Mustang Cobra Jet answered perfectly old Hot Rod maxim 'there ain't no substitute for cubes'.

Ask any knowledgeable blue oval enthusiast to name the quickest pure-production Mustang of the muscle car era, and most will say the 1968 Cobra Jet. It was packing a power plant based on the staid 428-cid big-car engine, but had larger valve heads and the race-brewed 427's intake manifold. It also had ram-air induction and a hood scoop that funneled air directly into a 735-cfm four-barrel carburetor. Output was an easy 410hp, but the factory rated it at 335hp in an effort to calm insurance agents and con drag strip rules-makers.

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born in Detroit, made in Murica

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1969 Ford Mustang Mach 1 428 Cobra Jet poster created from one of my images.

If you ask a well-informed fan of the blue oval about the fastest stock Mustang from the muscle car era, the majority will point to the 1968 Cobra Jet. This powerhouse was equipped with a modified version of the conventional 428-cid engine designed for larger vehicles, enhanced with bigger valve heads and an intake manifold borrowed from the race-inspired 427. Additionally, it featured ram-air induction and a hood scoop that channeled air directly into a 735-cfm four-barrel carburetor. While it easily produced 410 horsepower, the official factory rating was listed at 335 horsepower. This understatement was a strategic move aimed at appeasing insurance companies and deceiving drag racing rule-makers.

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Original Concept P-51 Paint job on Mach 1 Mustang

Ford Mustang Cobra Jet

Our designs are set up for classic car enthusiasts and is in no way affiliated any car company or car manufacturer. Any brand names on tags are used for descriptive purposes only.