The Boss 351 was also equipped for dyno use with a Meziere electric water pump. After two break-in cycles (programmed by the Super-Flow engine dyno), the Boss 351 was finally run in anger.

Bob Perkins, the world's foremost authority on Boss Mustangs and widely regarded as the best Mustang restorer anywhere, concurs. "I'd put my money on the Boss 351," he says when asked of the top ...

Kelly explained that every '71 Boss 351 came with a 3.91:1 Traction-Lok differential. Although the 429 CJ utilized the same 9-inch differential, the gear set in this particular car is a highway ...

Though the Boss 351 originally came with an Autolite 4300-D carburetor, our testing was run with the same 750-cfm HP Holley carb used on the Boss 302. See All 21 Photos ...

However, a head-to-head test between a 429 Mach 1 and a 351 Boss with the same (3.91:1) differential gearing was never conducted, so we can't say for sure that the 351 was the quickest Mustang ...

The 351 heads were based on the Cobra R heads, and O’Neill and crew attached the engine to a T56 Tremec six-speed manual, a Ford 9-inch rear end and a rear axle with a 3.83 final drive. The ...

So, in addition to being a one-year gem, the Boss 351 is also the scarcest iteration of the 1971 Mustang. The black/silver example you see here is one of those rigs, and it looks just as hot as ...

While big block muscle cars certainly dominated the quarter mile throughout the '70s, their lesser-powered small block ...

An original plan to stuff Ford’s 6.8-liter Triton V10 into it, but it didn’t fit, so they designed a new one by adding two cylinders to the modular 4.6-liter V8 to create a 5.8-liter, or 351 ...