There are many great Mustangs in the world, restored to like-new condition, looking for all the world like they just drove off the showroom floor. But for a few, great isn’t good enough. Great might not win the Team Shelby National Diamond Award; nor win Division 1 at the Shelby American Automobile Club Concours. Boss 429 KK 2500, however, is so righteous that it’s done both.
It’s easy for anyone to see why the Boss Nine has turned into a legend. As with many other great muscle cars, it has its roots in racing, in this case a new engine that needed to be homologated for NASCAR after Ford’s SOHC 427 Cammer was kicked out of competition.
The 429 is a truly exotic engine, from the O-ring dry-deck aluminum hemispherical cylinder heads; to the four-bolt main for the forged-steel crank; to the yawning 2.28 inch intake and 1.90 inch exhaust valves.
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