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separate from the cooling circuit for the head The "dry-deck" method of design is intended to strengthen the block by removing the open coolant jackets around the cylinder and reduce hot spots by providing more direct cooling. Each cylinder, oil passage and water passage had an individual "O" ring style seal to seal it tight. Although a head gasket is used, it only seals the cylinder for combustion so a failure at one point won't compromise the others.
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NASCAR style forged internals, and close to no smog or emissions equipment. They are said to be more powerful than the later "T" and "A" code engines (which had the emissions related equipment to satisfy government regulations). The engines in some cases were removed from the cars for use in other applications such as tractor pulling, due to the extreme torque and horsepower the engine was capable of producing.
466:), in that the only external identification of the car were the Boss 429 decals on the front fenders and unique enlarged hood scoop. The rest of the car featured a very clean look that was atypical of most performance Mustangs that Ford had produced, which often emphasized appearance over its reality. Both the spoiler and window louvers commonly seen on 1969–1970 Mach 1's and Boss 302's were missing.
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engine, and a manually controlled hood scoop for bringing in denser air for more thorough combustion. For better ground clearance the front spoiler was made shallower than the Boss 302's, and a 3.91 ratio rear axle came with a "Traction-Lock" limited slip differential. Other features included, color keyed dual racing mirrors, an 8,000rpm tachometer, and AM only radio.
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435:, the Boss 429 Mustang's NASCAR plans were scrapped. However, as the Boss 429 engine was homologated in the Mustang, Ford used it in NASCAR until 1974 in other Ford and Mercury body platforms, and later in NHRA Pro Stock class during the 1980's, its main proponent there being Bob Glidden's championship winning Pro Stock Thunderbird.
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A total of 859 Boss 429s were made by Ford in 1969, including two
Cougars for the Lincoln/Mercury Race Division. All had black interiors, and came in one of five colors: Raven Black, Wimbledon White, Royal Maroon, Candy apple Red, and Black Jade. The fully functional hood scoop was the same color as
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The
Mustang's engine compartment was not wide enough to accommodate the massive Boss 429 engine, so Ford contracted with Kar Kraft of Dearborn, Michigan, to modify 4-speed Cobra Jet Mustangs to accept it. Kar Kraft was a Ford exclusive experimental facility that functioned as Vehicle Engineering for
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was added to the rear end to limit body roll. This was the first
Mustang ever fitted with a rear sway bar, giving it better handling than the other large engine Mustangs of the time, making it a much more capable track car. So did an oil cooler which allowed both high RPM and endurance loads on the
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Production of the Boss 429 began in 1968 at the Ford Rouge plant, where front apron assemblies revised to accept the large Boss 429 engine were installed during vehicle construction. These also provided a stronger and cleaner front structure, important considerations on such a performance car, and
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All cars came with 4-speed manual transmissions and a rear-wheel drivetrain. The huge engine shoehorned into even a modified
Mustang front end left no room for air conditioning. Some early cars were known as "S" code cars and as such had a slightly different engine, with magnesium valve covers,
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at 3400 rpm. Period dynamometer testing supports Ford's rating. The speed equipment manufacturer Crane Cams tested engines that were stock as manufactured, with the exception of substituting tubular headers for the stock cast iron exhaust manifolds. For the 1969 hydraulic lifter engine, they
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The Boss 429 engine featured four-bolt main caps, a forged steel crank, forged steel connecting rods, and aluminum cylinder heads with a semi-hemispherical type combustion chamber which Ford called the "crescent". These used the "dry-deck" method, meaning the coolant circuit for the block was
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the car, and noticeably larger than anything else offered on any Ford product but the two Boss 429 Cougars. This scoop would carry over to the 1970 model year but would be painted black on all cars. To this day, it is the largest factory hood scoop ever installed on a production
Mustang.
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Instead, to show just how special these cars were, they were given special NASCAR identification that was placed on the driver's side door. Each car was given a "KK" number which stood for Kar Kraft. KK #1201 was the first Boss 429 and KK #2558 was the last Boss 429 made.
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Ford had already produced successful high-performance 427 cu in and 428 cu in racing engines from older blocks, but was looking to develop one based on its newest engine family to go forward with; specifically to attempt to challenge the extremely powerful but aging
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Ford made 499 Boss 429s in 1970. Five new exterior colors were available: Grabber Orange, Grabber Green, Grabber Blue, Calypso Coral, and Pastel Blue; and the interior was available in black or white and black. The hood scoops were all painted matte black. A
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have brought bids of over $ 375,000. In 2013 an unrestored black 1969 Boss 429 sold for $ 417,000 at Mecum
Auctions in Kissimmee, Florida. In 2016 a restored black 1969 Boss 429 sold for $ 500,000 at a Barrett-Jackson auction in Palm Beach, Florida.
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rules required that at least 500 cars be fitted with this motor and sold to the general public. After much consideration at Ford, the
Mustang was selected as the platform to offer the highly modified motor in.
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However, sales started to drop off for the 1970 Boss 429 Mustangs and with higher production costs and other internal Ford problems, it was decided that 1970 would be the last year of the Boss 429.
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measured a peak of 352.0 bhp (262.5 kW) at 5500 rpm. The 1970 mechanical lifter engine measured better, with a peak of 366.5 bhp (273.3 kW), also at 5500 rpm.
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was standard equipment. A dealer-installed option of a six-pack intake and three 2-barrel carburetors was made available, though very few of these were sold.
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Source: Don
Eichstaedt, Resident Engineer Kar Kraft Brighton Assy. Plant - 1969/70 Kar Kraft - 1966/1970, Ford Motor Company - 1971/1991
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in 1970 models to minimize valve float at high RPMs; the dual exhaust system was improved, but rated power stayed the same.
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mounted on an aluminum intake manifold that flowed well for its time. 1969 cars featured hydraulic lifters, switched to
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The cars were advertised at 375 bhp (380 PS; 280 kW) at 5200 rpm and 450 lb⋅ft (610 N⋅m) of
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were coupled with reworked front fenders. The cars were then shipped to Kar Kraft's new assembly plant in
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engine made the car nose heavy. To help offset this, the battery was relocated to the trunk, and a 3/4"
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Both model years featured a toned-down exterior compared to other performance
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The Boss 429 was produced in limited numbers in 1969 and 1970. Its origin is twofold: allow
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Classic
Recreations produces the 1969-70 Ford licensed Boss 429 as of April 2018.
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The distinctive enormous valve covers on a semi-hemispherical head Boss 429 engine
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666:"This Company will Sell You a Brand New 1969 Ford Mustang Boss 429"
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Today, these cars are highly sought after. As of 2008, auctions on
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With the release and homologation of the extreme 440-powered
639:"1969 Ford Mustang Boss 429 Specs & Performance Figures"
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in NASCAR's Grand National Division, now known as the
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1969 Ford Mustang Boss 429 A Profile of a Muscle Car
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548:"1970 Ford Mustang Boss 429 engine specs, photos"
424:An total of 1359 original Boss 429s were made.
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526:Trans Am muscle car Mustang variant 1969–1970
382:The Boss 429 engine came standard with a 735
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106:Learn how and when to remove this message
597:Cook, Terry (January 1970). "Boss 429".
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219:Front-engine, rear-wheel-drive layout
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44:adding citations to reliable sources
347:alternative to the 5.0 L and under
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235:429 cu in (7.0 L)
664:Woodard, Collin (Apr 19, 2018).
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31:needs additional citations for
746:Ford Mustang production models
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293:3,870 lb (1,755 kg)
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573:"1969 Ford Mustang Boss 429"
283:50.4 in (1,280 mm)
275:71.7 in (1,821 mm)
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1013:Rear-wheel-drive vehicles
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688:1969–70 Boss 429 Mustang
998:Cars introduced in 1969
820:Special Service Package
942:Other related vehicles
803:Ford in-house variants
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926:Galpin Rocket Mustang
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622:The Amazing Boss 429
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305:Ford Mustang variant
40:improve this article
949:Ford Mustang Mach-E
552:carswithmuscles.com
214:Longitudinal engine
884:Third-party models
825:California Special
407:Brighton, Michigan
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645:. 25 January 2023
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1003:Muscle cars
973:(1989–1997)
967:(1979–1986)
956:(1967–1973)
916:RTR Mustang
875:McLaren M81
643:motowag.com
370:. NASCAR's
96:August 2008
987:Categories
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694:1996–2007.
670:MotorTrend
531:References
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489:1969 Model
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259:Dimensions
225:Powertrain
185:Muscle car
156:Production
66:newspapers
865:Mustang I
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845:Boss 351
840:Boss 302
835:Boss 429
750:variants
649:28 March
518:See also
460:Boss 302
456:Boss 351
418:sway bar
364:426 Hemi
361:Chrysler
315:Overview
251:4-speed
189:Pony car
164:Assembly
141:Overview
850:Bullitt
582:July 8,
557:July 8,
480:and at
339:V8 for
216:mounted
200:2-door
80:scholar
1008:Coupés
855:FR500C
830:Mach 1
464:Mach 1
445:torque
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341:NASCAR
280:Height
264:Length
253:manual
231:Engine
209:Layout
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433:Dodge
272:Width
202:coupe
180:Class
87:JSTOR
73:books
794:2024
748:and
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329:Ford
309:Ford
299:The
150:Ford
59:news
810:SVO
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384:CFM
337:429
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