AMC AMX specifications by year — American Muscle Car Facts

Independent · Source-led · American performance history Issue 01 · 1951–2023

Red 1968 AMC AMX two-seater at a car show with the hood raised on its 390 V8, red-line tires and the AMX grille badge — 1968 AMC AMX 390 Go Pac in Matador Red, hood open Photo: Christopher Ziemnowicz, public domain, via Wikimedia Commons

1968

Measure	Value	Applies to
Shipping weight	3,097 lb	body 6839-7, as tabulated
Wheelbase	97 in	all 1968 AMX
Curb weight, 390 AMX	3,205 lb	390-powered AMX
Tires (standard)	E70x14 Goodyear Polyglas	all 1968 AMX
Overall length	177.22 in	all 1968 AMX
Overall width	71.57 in	all 1968 AMX
Overall height	51.73 in	all 1968 AMX
Tread, front / rear	58.36 / 57.00 in	all 1968 AMX
Headroom / legroom / shoulder room	37.20 / 43.30 / 55.00 in	all 1968 AMX
Fuel capacity (approx.)	19 US gal	all 1968 AMX
Trunk capacity (with space-saver spare)	9.6 cu ft	all 1968 AMX
Brake drum diameter / lining area	10 / 167.5 in / sq in	standard brakes
Steering overall ratio (standard / power / quick-ratio manual)	24.1 / 18.1 / 19.3 :1	all 1968 AMX
Engine compression ratio and bore x stroke	290: 10.0:1, 3.75 x 3.28 in; 343: 10.2:1, 4.08 x 3.28 in; 390: 10.2:1, 4.17 x 3.57 in (premium fuel)	by engine
Axle ratio, four-speed (standard; no-cost optional)	290: 3.54 (3.15); 343 and 390: 3.15 (3.54) :1	four-speed floor shift
Axle ratio, Shift-Command console automatic (standard; no-cost optional)	290: 3.15 (2.87); 343 and 390: 2.87 (3.15); 3.15 standard with 'Go' packages :1	automatic
Dealer-kit axle ratios	3.73, 3.91, 4.10, 4.44 :1	dealer installed

1969

Measure	Value	Applies to
Shipping weight	3,097 lb	body 6939-7, as tabulated
Wheelbase	97 in	1968–70 two-seat AMX
Curb weight, Super Stock AMX	3,050 lb	Hurst SS/AMX
Rear axle ratio, Super Stock AMX	4.44 :1	Hurst SS/AMX, Twin-Grip
Compression ratio, Super Stock AMX 390	12.3 :1	Hurst SS/AMX
Axle ratio, four-speed floor (standard; optional)	290: 3.54; 343 and 390: 3.54 (3.15) :1	AMX
Axle ratio, Shift-Command automatic on console (standard; optional)	2.87 (3.15) with 290, 343 and 390; 3.15 standard with Go Packages :1	AMX
Dealer-installed axle ratios	3.73, 3.91, 4.10, 4.44, 5.00 :1	any V-8 transmission combination, extra cost
Engine compression ratio and bore x stroke	290 4-bbl: 10.0:1, 3.75 x 3.28 in; 343 4-bbl: 10.2:1, 4.08 x 3.28 in; 390 4-bbl: 10.2:1, 4.17 x 3.57 in (premium fuel)	by engine

1970

Measure	Value	Applies to
Shipping weight	3,126 lb	body 7039-7, as tabulated
Wheelbase	97 in	all 1970 AMX
Overall length	179 in	all 1970 AMX
Weight	3,126 lb	basis not stated
Axle ratio, 360 or 390 with four-speed floor (standard; optional)	3.54 (3.15 and 3.91) :1	AMX
Axle ratio, 360 or 390 with Shift-Command automatic on console (standard; optional)	2.87 (3.15 and 3.54); 3.15 standard with Go Package and automatic :1	AMX
Dealer-kit axle ratios	3.73, 3.91 (also factory option), 4.10, 4.44, 5.00 :1	AMX and Javelin
Engine compression ratio and bore x stroke	360 4-bbl: 10.0:1, 4.08 x 3.44 in; 390 4-bbl: 10.0:1, 4.17 x 3.57 in (premium fuel)	by engine

1971

Measure	Value	Applies to
Shipping weight	3,244 lb	body 7179-8
Wheelbase	110 in	all 1971 Javelins
Overall length	191.8 in	all 1971 Javelins
Overall width	75.2 in	all 1971 Javelins
Tread, front / rear (V-8)	59.7 / 60.0 in	V-8 Javelins
Fuel tank capacity	16 US gal	all 1971 Javelins
Brake diameter (V-8)	10 in	V-8 Javelins
Standard tires, AMX	E70 x 14 black with white letters	Javelin AMX
Axle ratios, AMX (standard; optional)	360 2-bbl: 3-speed floor 3.15 (3.54), console automatic 2.87 (3.15); 360 4-bbl: 3-speed 3.15 (3.54), 4-speed 3.54 (3.15, 3.91), automatic 2.87 (3.15); 401: 4-speed 3.54 (3.15, 3.91), automatic 2.87 (3.15, 3.54); with Go Package and automatic 360 3.15 std (2.87 opt), 401 3.15 std (2.87, 3.54 opt) :1	Javelin AMX

1972

Measure	Value	Applies to
Shipping weight	3,149 lb	body 7279-8
Axle ratios, 360 and 401 (standard; optional)	360 2-bbl automatic 2.87 (3.15); 360 4-bbl automatic console 2.87 (3.15), 4-speed 3.54 (3.15, 3.91); 401 automatic console 2.87 (3.15, 3.54), 4-speed 3.54 (3.15, 3.91); AMX with Go Package and automatic: 360 3.15 std (2.87 opt), 401 3.15 std (2.87, 3.54 opt) :1	Javelin with 360/401
Fuel	regular-leaded, low-lead or no-lead, 91 octane or higher	all 1972 AMC engines

1973

Measure	Value	Applies to
Shipping weight	3,170 lb	body 7379-8
Wheelbase	110 in	Javelin and Javelin AMX
Overall length	192.31 in	Javelin and Javelin AMX
Overall width	75.2 in	Javelin and Javelin AMX
Fuel tank capacity	16 US gal	Javelin and Javelin AMX

1974

Measure	Value	Applies to
Shipping weight	3,184 lb	body 7479-8

1977

Measure	Value	Applies to
Wheelbase	108 in	Hornet
Overall length	186 in	Hornet hatchback
Tires	DR78 x 14	Hornet AMX (as reported on the featured car)

1978

Measure	Value	Applies to
Engines and compression	258 six 8.0:1, 3.75 x 3.90 in (4-speed floor standard, automatic floor optional); 304 V-8 8.4:1, 3.75 x 3.44 in (automatic floor only)	AMX Hatchback 2-dr.

1979

Measure	Value	Applies to
Wheelbase	96 in	AMX
Overall length	168.5 in	AMX
Overall width	71.8 in	AMX
Overall height	51.6 in	AMX
Track, front / rear	58.1 / 57.5 in	AMX
Cargo volume	24.8 cu ft	AMX
Curb weight	2,970 lb	AMX
Axle ratios (49 states / California / high altitude)	258 4-speed 2.53 / 2.73 / 2.53; 258 automatic 2.53 / 2.73 / 2.73; 304 4-speed 2.87 / NA / NA; 304 automatic 2.56 / NA / 2.87 (2.87 with Twin-Grip) :1	AMX

1980

Measure	Value	Applies to
Engine	4.2 liter (258 CID) 2V six, 8.3:1, 3.75 x 3.90 in (only AMX engine)	AMX
Axle ratio	2.53 (2.73 high altitude with automatic) :1	AMX

Each year's heading links to that model year's full fact sheet. Specification labels are carried as recorded and not normalized across years, so the same measure may be worded differently from one year to the next.