©2007 Publications International, Ltd.
The 1970 Ford Mustang Boss 302 was the carmaker's
answer to the Chevy Camaro Z28. See more muscle car pictures.

GM executive Semon "Bunkie" Knudsen, who used performance to revive Pontiac, defected to become president of Ford in early 1968. He brought along stylist Larry Shinoda, whose work included the Z28 that had unseated Mustang as '68 and '69 Trans Am champ. The Mach 1 was among their first efforts, but the most-special '69 and '70 Mustangs drew on Shinoda's nickname for Knudsen, "boss."

©2007 Publications International, Ltd.
The 1970 Ford Mustang Boss 302 used a fortified 302-cid
four-barrel V-8 rated at 290 bhp.
Like the Z28, the Boss 302 was built as a Trans Am road-racing qualifier. Its heart was Ford's 302-cid V-8 treated to the high-performance, big-port cylinder heads being readied for the famous Cleveland 351. The Boss's solid-lifter small-block used the biggest carb employed by Ford, a 780-cfm Holley four-barrel, and was underrated at the same 290 bhp as the Z28's 302. A Hurst-shifted four speed and 3.50:1 gears were standard; 3.91:1 and Detroit Locker 4.30:1 cogs were optional. Underneath were racing-inspired suspension modifications, Polyglas F60xl5s, and power front discs.

©2007 Publications International, Ltd.
Street versions of the Boss weren't as fast as their racing
counterparts but did have good cornering ability.

Shinoda's expertise in aerodynamics influenced the Boss's exterior. Mustang's phony fender vents were enclosed and a front spoiler was fitted; a rear air foil and backlight blinds were optional. Blackout trim and stripes finished the look. Ford built 1,628 Boss 302s for '69, then came back with 7,013 for '70, when quad headlamps were traded for double units flanked by fake air intakes, a "shaker" hood scoop was made available, and the engine got smaller intake valves and a 6000-rpm rev limiter.

©2007 Publications International, Ltd.
The rear air foil and backlight blinds were optional
in the 1970 Ford Mustang Boss 302.

In Trans Am, racing Boss 302s retook the '70 crown from Chevy. Street versions weren't always as fast as a 302 Z28, but they had more cornering power and a less-peaky, more-flexible engine. "The Boss 302 is a hell of an enthusiast's car," said Car and Driver. "It's what the Shelby GT 350s and 500s should have been but weren't."

The 1970 Ford Mustang Boss 302Specifications
Wheelbase, inches: 108.0
Weight, lbs: 3,300
Number built: 7,013
Base price: $3,720

Standard Engine

Type: ohv V-8

Displacement, cid: 302
Fuel system: 1 x 4bbl.
Compression ratio: 10.5:1
Horsepower @ rpm: 290 @ 5800
Torque @ rpm: 290 @ 4300

Representative Performance
0-60 mph, sec: 6.5
1/4 mile, sec. @ mph: 14.8 @ 96

Source: How Stuff Works / Howstuffworks.com: