2018 Shannons Sydney Classic Auction in Conjunction with the Hot Rod & Custom Auto Expo

1970 Ford Mustang Boss 429 Fastback (LHD)


Passed In


Engine V-8, 429-cid
Gearbox 4-speed manual
Body Work Fastback
Colour Grabber Blue
Interior Black
Trim Vinyl
Wheels Steel disc
Brakes Discs/Drums


This lot is no longer available

In muscle car terms, the Boss models built in 1969-1970 have grown in stature to become some of the most desirable Pony cars of all and the Boss 429 is widely regarded as the biggest, baddest Mustang ever sold to the public.  The Boss 429 was essentially a street dragster used to homologate the big-block engine for NASCAR while Ford used the smaller-engined Boss 302 to homologate the Mustang for the SCCA's Trans-Am road racing series.  Brainchild of Ford president Bunkie Knudsen, who came up with the idea of dropping the 385-series 429-cid V8 into the Mustang sportsroof, teaming up with Larry Shinoda to create the ‘Boss’ package.  Unlike the regular production Boss 302, the Boss 429 Mustang was hand-built at the Kar Kraft facility in Brighton, Michigan and each car was assigned an individual KK number between KK1201 and KK2558.  Production commenced in January 1969 and 859 units were completed that model year, with a further 500 examples completed as revised 1970 cars.  The Mustang’s engine compartment was extensively modified, with relocated shock towers and revised suspension, a ¾-inch rear sway bar, boot-mounted battery and a reinforced HP429 engine block with four bolt mains, forged steel crank and con-rods, Hemi-type alloy cylinder heads, a 735 cfm carburettor, hydraulic lifter camshaft on 1969 models and an engine oil cooler.  The transmission was a four-speed close ratio manual and 3.91 rear axle with Traction Lok.  The striking Boss package consisted of a front spoiler, manually controlled bonnet scoop, chrome Magnum 500 wheels with Goodyear Polyglas GT tyres and a Deluxe Décor interior featuring an 8000 rpm tacho and AM radio as standard.  Today, the Boss 429 has become the most sought after and valuable street Mustang ever built and with ground-thumping performance, tough looks and rarity it’s not hard to see why.