1973 Ford Mustang Mach 1 351 Cobra Jet

Pony car powered by Ford 351 Cleveland Cobra Jet V8.

Stock-presenting 1973 Ford Mustang Mach 1 photographed by BUTTON74; used as exact-year model context rather than proof of the Q-code drivetrain

Body Mach 1 SportsRoof, door-data-plate body code 63R

Engine Q-code 351 Cleveland four-barrel Cobra Jet V8

Output 266 hp SAE net and 301 lb-ft reported

Production 35,440 Mach 1s across all engines; exact Q-code subtotal unresolved

Story

1973 Ford Mustang Mach 1 351 Cobra Jet

The Q-code 351 four-barrel was the top Mustang engine for 1973. Ford technical material identifies the application as 351-4V (CJ), while period public-facing language was not always consistent about spelling out Cobra Jet. This page uses the collector-recognized 351 Cobra Jet name while preserving Q-code and factory-document context.

Reviewed records support a 266 hp SAE-net rating, Motorcraft 4300D four-barrel carburetion, four-speed manual and C6 automatic paths, power front disc brakes, competition suspension, and a Ford 9-inch rear axle. Axle ratio, transmission code, Ram Air equipment, and component dates still need to match the individual car's warranty label and factory records.

Ford built 35,440 Mach 1 SportsRoofs in 1973 across all engines and 134,867 Mustangs across the model line. Neither number is a Q-code subtotal, so exact Mach 1 351 Cobra Jet production remains unresolved here.

Authentication starts with Q in the VIN engine position and 63R on the door data plate for the Mach 1 body. The invoice or Marti report, engine castings and dates, carburetor tag, transmission tag, axle tag, paint, and trim should agree. A Ram Air hood, stripes, spoiler, wheels, or 351 decals cannot prove a factory Q-code car by themselves.

Stock-presenting yellow 1973 Mustang Mach 1 with 351 Ram Air hood callout, used for grille, bumper, hood, stripe, wheel, and body context; visible decals do not independently prove the Cobra Jet drivetrain.Pujanak via Wikimedia Commons · Public domain

Price history

Values

Nominal dollars from original price sheets, auction archives, and approved value references.

Original Price

A verified original price is not yet available for this car.

Market Observations

Price guide value $24,800

Jul 28, 2026 · Hagerty Valuation Tools · Current guide point
Current #3 good-condition guide benchmark for the exact 1973 Mustang Mach 1 SportsRoof with the 351cid/264hp four-barrel Cobra Jet engine. · unknown · good Hagerty showed $24,800 when accessed on 2026-07-28. This is an unadjusted guide value, not a completed transaction or proof of a particular car's originality.
1973 Ford Mustang Mach 1 351cid/264hp Cobra Jet
Auction sale $25,000

May 18, 2026 · Bring a Trailer
Q-code Mach 1 3F05Q220478 with a C6 automatic, Deluxe Marti Report, build sheet, and a rebuilt overbored engine. · modified · good Bring a Trailer records the $25,000 completed sale. Engine revisions plus induction, suspension, air-conditioning, and wheel changes make this a modified-car observation.
1973 Ford Mustang Mach 1 351 Cobra Jet 3F05Q220478
Auction sale $27,250

Feb 27, 2025 · Bring a Trailer
Q-code Mach 1 3F05Q219510 with a four-speed manual, repaint, and aftermarket carburetor, intake, headers, exhaust, shackles, and wheels. · modified · good Bring a Trailer records the $27,250 completed sale. The disclosed modifications and visible corrosion keep this observation separate from restored-stock examples.
1973 Ford Mustang Mach 1 351 Cobra Jet 3F05Q219510
Auction sale $27,000

Mar 19, 2024 · Bring a Trailer
Q-code Mach 1 3F05Q155818 with a C6 automatic, Deluxe Marti Report, records, refurbishment, and repaint. · restored · good Bring a Trailer records the $27,000 completed sale. Visible wear and a reproduction door sticker whose color and trim codes differ from the Marti Report limit its use as an authenticity benchmark.
1973 Ford Mustang Mach 1 351 Cobra Jet 3F05Q155818
Auction sale $23,250

Dec 1, 2023 · Bring a Trailer
Q-code Mach 1 3F05Q242595 with a C6 automatic and Deluxe Marti Report; prior paint and aftermarket intake, ignition, fuel-system, wheel, and traction-bar changes are disclosed. · modified · good Bring a Trailer records the $23,250 completed sale. The custom title brand and non-stock equipment make this a modified-car observation rather than an originality benchmark.
1973 Ford Mustang Mach 1 351 Cobra Jet 3F05Q242595

Values move with paperwork, originality, options, condition, venue, and body style. High bids and guide values are labeled separately from completed sales.

Reference records

Options, Colors & Components

Source-backed details for trim, chassis, production, and authenticity.

Engine Details

Motorcraft 4300-D 4V carburetor, manual transmission D3ZF-LA · 1973 351CJ-4V Ford Mustang with 4-speed manual transmission, 50-state application · carburetor / engineering number
Motorcraft 4300-D 4V carburetor, C6 automatic transmission D3ZF-MA · 1973 351CJ-4V Ford Mustang with C6 automatic transmission, 50-state application · carburetor / engineering number
Motorcraft 4300-D 4V carburetor airflow 715 cfm · 1973 351CJ-4V Ford Mustang Motorcraft 4300-D carburetor applications · carburetor / specification

Transmission

Factory transmission Ford four-speed manual
Factory transmission Ford C6 SelectShift automatic
Factory transmission Ford four-speed wide-ratio manual, optional with 351 4bbl

Options

351 Cobra Jet reference for the 1973 Ford Mustang Mach 1 351 Cobra JetClassic Muscle · Reference illustration

Q 351 4V Cobra Jet engine option optional · performance · Optional Q-code 351-4V Cobra Jet engine; equipped with dual exhaust, four-barrel carb, and hydraulic lifters.
Mach 1 Mach 1 SportsRoof package factory · appearance · Standard Mach 1 package on SportsRoof body, including honeycombed grille, vertical turn lamps, black/argent rear applique, sport mirrors, and side/decklid decals.
Competition Suspension Competition Suspension optional · chassis · Included standard with Q-code engine option; includes heavy-duty springs, shocks, and front and rear stabilizer bars.
Exterior Decor Group Exterior Decor Group optional · appearance · Optional package adding hockey stick side stripes and lower body color-keying.

Paint

9A Wimbledon White factory · solid
2B Bright Red factory · solid
6C Medium Yellow Gold factory · solid_or_metallic
3D Medium Blue Metallic factory · metallic
5H Medium Brown Metallic factory · metallic
3K Blue Glow factory · metallic
5M Medium Copper Metallic factory · metallic
4N Medium Aqua factory · solid
4P Medium Green Metallic factory · metallic
4Q Dark Green Metallic factory · metallic
5T Saddle Bronze Metallic factory · metallic
3B Light Blue factory · solid
6E Medium Bright Yellow factory · solid
4B Bright Green Gold Metallic factory · metallic
4C Ivy Glow factory · metallic
6F Gold Glow factory · metallic

Production

Transmission Choices reference for the 1973 Ford Mustang Mach 1 351 Cobra JetClassic Muscle · Reference illustration

1973 Mustang total production total · 134,867 · reported
1973 Mustang Mach 1 total production (body 63R) by body · 35,440 · reported

Authenticity

Ford 9-Inch Rear reference for the 1973 Ford Mustang Mach 1 351 Cobra JetClassic Muscle · Reference illustration

VIN engine code Q for 351-4V Cobra Jet V8 · Fifth character of the VIN (on windshield dashboard plate and door warranty plate) · fraud detection
Body code 63R for Mach 1 SportsRoof with bucket seats · Body style field on the door warranty/data plate; corroborate with the VIN and factory records · trim correctness
Engine code decal 351C-4V Q-code engine code decal K621SG · Underhood engine code decal location; verify against the individual car and factory paperwork · trim correctness

Still Researching

engine The Q-code identity and major specifications are recorded, and reported Motorcraft 4300-D carburetor engineering-number paths for manual and C6 applications have been added, but a complete casting, distributor, emissions, and date-code matrix is not.
transmission Four-speed and C6 paths are recorded, and a corroborative mechanical table narrows the 351 4bbl manual path to an optional four-speed wide-ratio transmission while listing Select-Shift as optional, but the full tag, detailed ratio, shifter, and application matrix is incomplete.
rear axle The 9-inch and 3.25/3.50 paths are recorded, and the factory AMA power-team table now narrows the 351-4V CJ ratio paths by four-speed manual, automatic, and A/C-available notation, but door-plate axle-code mapping, axle-tag identifiers, and car-specific confirmation remain incomplete.
brakes Power front-disc and rear-drum equipment is recorded, but complete component dimensions and service identifiers are not.
suspension Competition suspension is recorded, but spring, shock, and stabilizer identifiers are incomplete.
option packages The Q-code and Mach 1 paths are recorded, but the full compatibility and price matrix is not.
production Mach 1 and model-line totals are recorded, but exact Q-code Mach 1 production is unresolved.
paint colors Sixteen model-year colors are recorded, but Q-code frequencies and individual combinations are not.
trim and appearance Major 1973 Mach 1 cues are recorded, but every stripe, wheel, tire, spoiler, hood, and molding combination is not.
interior Major cabin records are present, but the complete trim-code and option compatibility matrix is not.
authenticity markers VIN and body-code checks are recorded, and one Q-code 351C-4V engine-code decal identifier is now recorded, but casting, drivetrain tags, emissions labels beyond that decal, and date guidance remain incomplete.