The 1971 Mustang was a larger, new-body redesign built to accept big-block power, with hardtop, SportsRoof, convertible, Grande, Mach 1, Boss 351, and 429 Cobra Jet identities.
1971 Ford Mustang Mach 1 2Coupe / Mach 1
The 1971 Mach 1's stance, trim, and model-year exterior details are clear in this photo.
Photo: Mustang Joe · Source · CC0Image rights & changes
Auto-oriented, resized, and metadata removed for web display.
1971 Mustang GrandeHardtop / Grande
Grande badging/trim on the hardtop body covers the luxury-oriented side of the 1971 lineup.
Source · CC0Image rights & changes
Auto-oriented, resized, metadata removed, and visible license plates blurred.
1971 Mustang Boss 351SportsRoof / Boss 351
Boss 351 graphics and the larger 1971 SportsRoof body make this a key special-edition reference.
Source · CC0Image rights & changes
Auto-oriented, resized, metadata removed, and visible license plates blurred.
1971 Ford Mustang 4.9 V8 ConvertibleConvertible
Different 4.9 V8 convertible keeps open-body coverage without repeating the AlfvanBeem parade car.
Photo: Kieran White from Manchester, England · Source · CC BY 2.0Image rights & changes
Auto-oriented, resized, metadata removed, and visible license plates blurred.
1971 Ford Mustang in Electric BlueCoupe
Electric Blue coupe coverage broadens the 1971 gallery beyond the convertible photo run.
Photo: crudmucosa · Source · CC BY 2.0Image rights & changes
Auto-oriented, resized, metadata removed, and visible license plates blurred.
Overview
Introduced in September 1970, the 1971 Mustang grew again, including additional width intended to make big-block V8 installation easier.
Three body styles carried forward: hardtop, SportsRoof, and convertible, with Grande hardtops and Mach 1 SportsRoofs as major trim identities.
The Boss 351 replaced the Boss 302 and Boss 429 as the main Boss-branded street performance Mustang.
Production Breakout
Model / Body Style
Units
Type
Hardtop
65,696
Body / trim
Grande hardtop
17,406
Body / trim
SportsRoof
23,956
Body / trim
Mach 1 SportsRoof
36,499
Body / trim
Convertible
6,121
Body / trim
Mach 1
36,499
Special edition
Boss 351
1,806
Special edition
Grande
17,406
Special edition
Spring Special
Reported: 9,002
Special edition
Engines & Power
Code
Engine
Induction
HP
Torque
Availability
L
250 cid Thriftpower inline-six
1-barrel
145
232
Base six-cylinder engine
F
302 cid Windsor small-block V8
2-barrel
210
296
Base V8 and base Mach 1 engine
H
351 cid Cleveland V8
2-barrel
240
350
351C 2V option
M
351 cid Cleveland V8
4-barrel
285
370
351C 4V option before late-year Q-code overlap
Q
351 cid Cleveland Cobra Jet V8
4-barrel
285
370
Late-1971 351 Cobra Jet / GT engine
R
351 cid Boss 351 V8
4-barrel
330
370
Boss 351 only
C
429 cid 429 Cobra Jet V8
4-barrel
370
450
429 Cobra Jet option
J
429 cid 429 Super Cobra Jet V8
4-barrel
375
450
MustangSpecs reports 370 hp (at two different RPM points) for this engine, a minor variance from this figure; both agree on 450 lb-ft. No primary Ford rating sheet was found to arbitrate.
429 Cobra Jet Ram Air / Super Cobra Jet with Drag Pack gearing
Specifications
MustangSpecs reports 189.5-inch overall body length, 74.1-inch width, 50.8-inch height (Hardtop) / 50.1-inch height (Fastback), and a 109.0-inch wheelbase — one inch longer than the 108.0-inch wheelbase used from 1965 through 1970.
Counts distinguish verified production records, attributed reports, disputed figures, announced limits, and figures that do not survive in available records.
Option or package
Ford code
Market
Availability
Units
Count status
Ram Air Hood
Dual NACA duct hood with functional vacuum-actuated fresh air.
Decode the VIN and door data plate together. The VIN identifies the model year, plant, body, engine, and serial sequence; the data plate adds paint, trim, scheduled build date, DSO, axle, and transmission codes.
For Mach 1, Boss, Shelby, Grande, GT/CS, Sprint, or regional-special claims, compare the door tag to a Marti report, registry entry, buck/build documentation, and package hardware such as suspension, stripes, spoilers, scoops, wheels, and interior trim.
Special & Tuner Models
Mach 1
Production
36,499 built
Identity
SportsRoof-based performance and appearance model that became the main image car for the larger 1971 body.
Body / basis
SportsRoof-only image/performance model using the larger 1971 body shell.
Appearance
Color-keyed urethane front bumper, honeycomb grille with sport lamps, lower-body paint, Mach 1 decals, pop-open gas cap, and NACA-style hood scoop treatment.
Chassis / options
Competition suspension identity with available Ram Air, rear spoiler, rear-window SportSlats, and 302/351/429 powertrain paths depending on order.
Role in lineup
Mainstream performance-image Mustang for 1971, carrying the visual drama that earlier GT and Boss models made famous.
Why it matters
Mach 1 branding ties the year to Mustang performance-image history.
Boss 351
Production
1,806 built
Identity
One-year Boss model based on the SportsRoof with a high-output 351 Cleveland, four-speed manual, and aggressive Mach-like appearance.
Body / basis
One-year SportsRoof Boss model built around the larger 1971 body.
Engine
R-code high-output 351 Cleveland V8 with four-barrel induction, rated at 330 gross horsepower.
Driveline
Four-speed manual performance package with Boss-specific calibration and high-output 351 hardware.
Appearance
Aggressive Mach-like visual treatment with Boss 351 identity, stripes, and performance-oriented SportsRoof presentation.
Why it matters
Homologation, road-course, or high-output performance identity that enthusiasts track closely.
Grande
Production
17,406 built
Identity
Luxury hardtop with vinyl roof, Grande badging, and upscale interior treatment.
Body / basis
Hardtop-only luxury trim, separate from SportsRoof and convertible performance identities.
Comfort / trim
Vinyl roof identity, Grande badging, upgraded interior appointments, softer personal-luxury positioning, and quieter cabin character.
Role in lineup
Gave 1971 buyers a premium cruiser version of the Mustang rather than a drag-strip or road-course image car.
Why it matters
Package-specific trim, colors, and paperwork drive authenticity and value.
Spring Special
Production
Reported: 9,002Blake Villanueva, in a comment on MustangSpecs.com dated 2020-12-14, citing his own Marti report
One owner's individually-reported Marti report sequence number for their 1971 Spring Special. A traceable enthusiast estimate with named attribution, not a published Ford or Marti aggregate count. The same comment separately reports his specific 302/C4/Blue configuration as 1 of 197.
No published Ford, Marti Auto Works, or registry aggregate count has been confirmed. A named, dated reader comment (Blake Villanueva, 2020-12-14, on MustangSpecs.com) reports his own car's individual Marti report as "1 of 9002 built," which is preserved as an attributed traceable estimate, not a verified factory total. The 149,678-car model-year total is a ceiling for this package, not an estimate of how many were built.
Identity
Limited spring hardtop package adding Mach 1-style cues such as side stripes, two-tone paint, urethane bumper, and honeycomb grille with sport lamps.
Body / basis
Spring promotional hardtop package that borrowed visual cues from higher-profile performance Mustangs.
Appearance
Boss side stripes (no lettering), NASA hood, Mach 1 grille with sport lamps, E70x14 whitewalls, hubcaps with trim rings, dual sport mirrors, and Mach 1's coordinated moulding/bumper treatment.
Production uncertainty
No verified aggregate total is published; the one identified count comes from a single owner's individual Marti report, reported second-hand.
Why it matters
Shows Ford using mid-year appearance packages to keep the larger 1971 Mustang fresh in showrooms.
The 1971-1973 shape is strongly associated with high-impact period colors, two-tone Mach 1 treatments, and bold NASA-style hood graphics.
MustangSpecs reports 18 exterior colors for 1971 in one place and 19 in another on the same page; the discrepancy is unresolved.
1971 paint, interior, DSO, axle, and transmission codes live on the door data plate; rare colors, two-tone treatments, Mach 1/Boss/Shelby striping, and special-order paint are best verified with a Marti report or registry documentation.
Three-speed manual, four-speed manual, and automatic transmissions were available, with high-performance axle and Drag Pack combinations tied to Cobra Jet big-block ordering.
The 1971-1973 Mustang is the largest first-generation body and often divides enthusiasts between big-body muscle fans and early pony-car purists.
The 1971 429 Cobra Jet and Super Cobra Jet were the last true big-block engines offered in a first-generation Mustang.
First-generation Mustang changes make more sense against the original brief: affordable style, huge personalization, and a platform Ford could build in volume.
The 1971 body was long and wide enough that restorers often treat it as its own sub-era inside the first generation rather than a simple facelift of the 1969-1970 cars.
The Boss 351 used a high-output Cleveland small-block, giving 1971 a one-year Boss identity after the Boss 302 and Boss 429 ended.
429 Cobra Jet and Super Cobra Jet availability made 1971 the last Mustang model year with true first-generation big-block power.
Owner Finds
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Year-Correct Floor Mats
A tidy first upgrade for a driver-quality car: look for well-reviewed, properly fitting mats with licensed Mustang branding and heel-pad durability.
