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Jeep Engine: AMC 304 V8

AMC 304

 Jeep Engines 

287(4.7L) V8
360(5.9L) V8
318(5.2L) V8
242(4.0L) I6
150(2.5L) I4
173(2.8L) V6
GM 151 I4
AMC 401 V8
AMC 360 V8
AMC 304 V8
AMC 258 I6
AMC 232 I6
"Dauntless" 350 V8
"Dauntless" 225 V6
"Vigilante" 327 V8
"Tornado" 230 I6
Perkins 192 I4
"Hurricane" 226 I6
"Hurricane" 134 I4
"Go Devil" 134 I4

Engines

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General


The AMC 304 uses a cast iron block and heads with over head valves and hydraulic lifters. The AMC 304 was introduced in Jeep vehicles in 1971 in J-series pickups and Wagoneers and in 1972 in the CJ vehicles. Early 304s performed well, so well that frame changes were made to the CJs in '73 to prevent cracks.

Meeting legal requirements for smog controls on the 304 severely hurt performance of the engine. The last two years of the 304 in the CJ were in '80-'81. The horse power and torque specifications of the last version of the 304 narrowly beat the 258 use at this time. The 258 used between '80 and '81 was putting out 110 HP @ 3500 and 195 ft/lbs @ 2000.

The 304 used from '80-'81 in CJs, J-series pickups, and Wagoneers suffers in performance.

AMC 304 V8
Bore x Stroke3.75" x 3.44"
Displacement304(4.98L)
Compression Ratio8.4:1
Horsepower (net)125@3200
Torque (net)220@2400
Main Bearings5
Valve ConfigurationOHV
Fuel2bbl

The '79 304 saw a significant drop in horse power from previous years.

AMC 304 V8
Bore x Stroke3.75" x 3.44"
Displacement304(4.98L)
Compression Ratio8.4:1
Horsepower (net)130@4200
Torque (net)245@2500
Main Bearings5
Valve ConfigurationOHV
Fuel2bbl

The 304 used from '72-'78 has the best performance of all the 304s used in the CJ. The 304 was not offered in J-series pickups and Wagoneers after 1972.

AMC 304 V8
Bore x Stroke3.75" x 3.44"
Displacement304(4.98L)
Compression Ratio8.4:1
Horsepower (net)150@4200
Torque (net)245@2500
Main Bearings5
Valve ConfigurationOHV
Fuel2bbl

The ratings for the 304 used in '71 J-series pickups and Wagoneers are gross ratings.

AMC 304 V8
Bore x Stroke3.75" x 3.44"
Displacement304(4.98L)
Compression Ratio8.4:1
Horsepower (gross)210@4400
Torque (gross)300@2600
Main Bearings5
Valve ConfigurationOHV
Fuel2bbl

AMC 304
AMC 304
AMC 304

Contributors

Photos courtesy Brian Coday

Last modified Wednesday, 01-Dec-2010 08:33:48 MST


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dean w bair (5/19/2013)
is there a coopers element in anyway assosciated with the jeep moters?

jerry (12/18/2012)
where can i get a 304 engine for a 1073 jeep?

danny white (10/6/2012)
I just purchased 81 scrambler with auto trans and 304-v8. I am starting restoration, any suggestions ?

danny white (10/6/2012)
valve covers are red, is this std. color for amc 304.

Darryl (8/21/2012)
I have a 78 cj7, I think the motor has been changed out with a 72 amx 304, need to know at what rpm to be running when setting the timing and what the dwell should be at and the timing set at. It has a edelbrock 600 and headers on the motor. Is the motor id number on the back or front of the block.

Rasmus Rahm (3/20/2012)
Hello, im interested in a engine for my pacer, 304 or 360, maybe even 401?
All tho, i live in sweden, so it might not be possible?
Best regards Ralle

howard (7/19/2011)
I have a 1987 wrangler with a 304 motor and a three speed automatic. I have found a 1991 jeep cherokee with the 4.0 and an automatic.Will this transmission out of the cherokee bolt up to the wrangler with out modifying anything?

yovany (4/18/2011)
how can i put an automatic transmission on my 78 cj7 with a 304 engine?? It has a three speed already.

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