The Boss 429, on the other hand, rolled off the assembly line so that Ford could use the then-new 429-cubic-inch (7.0-liter) V8 in the NASCAR-spec Talladega.

To homologate a new engine destined for NASCAR use, Ford decided to squeeze it into a road-legal Mustang, creating the Boss 429, one of the most iconic pony cars ever built.

The Boss 429 needs no presentation, but did you know that this older, more obscure Ford model will leave the famed Mustang in ...

Check out this 1969 Ford Boss Mustang that has a 429-cube NASCAR egine, Goodyear Polyglas Tires, and a four-speed Top Loader transmission inside Popular Hot Rodding Magazine.

The Boss's time came when Rick bought a stash of Holman-Moody Boss 429 NASCAR parts. He got to thinking what a kick he could have building this car with those neat speed parts.

If the Boss 429 was a failure as a street supercar, it certainly prevailed in the discipline it was intended for. Nineteen sixty-nine would be a banner year for Fords in NASCAR, a double whammy ...

But by that point, the factory was installing the T-series Boss 429 and not the NASCAR-derived S-series as used in Bill's Mustang. Bill insisted on getting an S-series replacement.

Offered for just two model years, the Boss-9, as enthusiasts call it, came about in response to NASCAR homologation rules that said at least 500 examples of a race car must be sold in street form ...

Ford’s Boss 429-powered Mustang was a homologation special that allowed Ford to run its Chrysler Hemi competitor in NASCAR. Surprising no one, the engine bred for NASCAR’s superspeedways ...

While the BOSS 302 was produced for the Trans Am Racing Series, the BOSS 429 was meant to fulfill Ford’s needs to homologate the 429 V-8 engine for the NASCAR series.

They had a little trouble finding those fellows mostly because of the sticker price. New, this Boss 429 would’ve fetched $5,000, more than $2,000 over the base Mustang, the 428.