The Mustang, introduced in 1964, was a big hit among car enthusiasts. But it's the ultra-rare 1968 Shelby ... 428 engine, aka Cobra Jet, on the GT500. It was subsequently called the Cobra GT500 KR.

The car, dubbed the KR ... for its Cobra Jet advertising campaign. See All 7 Photos On April 1, the 428 Cobra Jet was introduced to the world as a new 335hp performance option for the Mustang ...

If you’re in the market for a late 60s Mustang ... a Cobra Jet fuel cap, Cobra Jet fender badges, a rear spoiler, sequential taillights and a set of ten-spoke 15-inch alloy wheels with Shelby ...

Conservatively rated at 335 horsepower, the 428-cubic-inch Cobra Jet engine was, at the time, the biggest displacement production powerplant ever fitted to a Mustang. See All 12 Photos By the late ...

Even though later G.T. 500 KRs and all '69 and '70 G.T. 500s were upgraded with the more potent 428 Cobra Jet ... All 24 Photos Dimensionally identical to the Shelby 428, the 390 Mustang exhaust ...

There it was designated EXP500 and fitted with a 428-cubic-inch Cobra Jet engine ... the end of the project—another Shelby prototype, the "Little Red" Mustang notchback, was only recently ...

Watch as host Bud Lindemann heaps praise on a (then) brand new 1968 Shelby Mustang 500KR after giving ... the 1968 Shelby had at the time. The 428 Cobra Jet V8's 360hp were the "fangs of the ...

From the Archive: 1967 Mustang Shelby GT500 ... year ownership. The KR—for “King of the Road”—was a development of the ’68 GT500, with the so-called Cobra Jet 428-cubic-inch engine ...

In 1967, the New York auto show played host to the launch of the original GT500KR, a version of the Shelby Mustang powered by a 428-cubic-inch Cobra Jet V-8 rated ... the 2008 KR outdoes its ...