amc 304 vs 360

It always starts right away and doesn't hessitate or complain.

3 Answers. I can build an engine, but, I can't drain oil without a mess.

The earlier series (290, 343, 390) has a different deck height than the later 304, 360, 401 series. It has enough power for me (so far) and runs pretty well. I have a 360/TF999 combination with Edlebrock performaer intake and carb and get an average of 12.3 mpg.

This new AMC engine defied categorization to a degree in that it was m… 401 steel crank, 360 cast. I would also look for a complete running 360 out of a FSJ so you can take everything needed; brackets, intakes, manifolds, carb, wiring harness, etc.

Good luck, I like the MoPar 1992-2993 Magnum 5.9 (Updated Chrysler LA 360). Oh, another thing to consider w/the 360 and especially the 401 is w/the increased power the components you put behind it will need to be up to the task. I have no complaints about the 360. AMC stamps the engine displacement on the sides of thier block in large numbers so its easy to tell what you getting. Differences are only in displacement and whether the flywheel is internally or externally balanced. Thanked 0 Times in 0 Posts Obviously the 360 and 401's have more power and probably about the same gas mileage (all poor, avg btwn 8-16). You can put 304 heads on a 360, but performance will suffer, and with a bigger cam, there may be valve/piston clearance issues. Summer blends act like it's 'cut' with donkey urine. In Kalifornia we have our own "special" gasoline that makes me run much less spark advance on my FS Jeep.

Running a small-valve 304 in anything reminds me of the old saying - "dictated by poverty or a keen sense of adventure". - 360s seemed so much easier to keep running cool and also make good oil pressure than 401s. '68Jav, and '90 Gold Rush trailer
So what makes them different? Don't have a ton of info for you but I do know that the AMC 304, 360, and 401 are all externally identical. The 304,360,390 and 401 AMC engines are all the same block. The cylinder bore was 4.08 inches and the crankshaft stroke was 3.44 inches. The 390 and 401 are great engines but you will start getting into overheating problems with the stock Jeep radiator. How can I visually tell the difference? The 304 and 360 are very similar except for displacement and the valve sizes. Plus bottom end torque is no contest. 258, 304, 343, 360, 390, 401. I have the 304, as do many others, because that is what came in CJ's in the late 70's/early 80's. I can build an engine, but, I can't drain oil without a mess. All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.We have a Billion Dollar fraud outfit here called the Air Resources Board that thinks the federal fuel standards from the EPA aren't good enough. The 304 was dropped by the end of 1981—likely due to the fact that AMC's six-cylinder was making more horsepower than it, and its emissions were no better than the 360's. It has enough power for me (so far) and runs pretty well. Aftermarket companys like Edelbrock are starting to recongnize the AMC motors more. 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 Thank you. the 360 is a fine engine and can be built to some high numbers but a 401 with the same money spent on a …

Oh, another thing to consider w/the 360 and especially the 401 is w/the increased power the components you put behind it will need to be up to the task. Your donations help keep this valuable resource free and growing.

Smog bridged rocker heads. Thanked 0 Times in 0 Posts //-->

You will also find that your gas milliage will be pretty close to the same if not a little better depending on how you drive it. The 304,360,390 and 401 AMC engines are all the same block. Here's a link to some information I put together preparing for my 360 swap (about 2 yrs ago).

304 cu in (5.0 L) 327 cu in (5.4 L) 343 cu in (5.6 L) 360 cu in (5.9 L) 390 cu in (6.4 L) 401 cu in … Mine has always gotten me where I needed to with reasonable power, fuel economy, and smoothness.


I'm not saying even a stock 304 won't scream, just don't know how much power it will make in STOCK form at high rpm, so why twist it that hard? You will also find that your gas milliage will be pretty close to the same if not a little better depending on how you drive it. It leaks like a mutha (front main seal and others). It went 6800 with ease. Kinda eats off the wax, attracts dirt, and causes a fire hazard. A buddy of mine spun 6800 rpm with a stock long block 304. Visual difference between AMC 304 & 360?? the 401 also has higher nickle content in the block = stronger block. Unless your going to drag race I would stick with the 360.

The 390 and 401 are great engines but you will start getting into overheating problems with the stock Jeep radiator. Going from a I6 to the V8 will require changing mounts and likely a different transmission, driveshaft mods, etc. One other thing.

'04Ram,'99Plym.Van,"96Exploder,'79Dodge pickup, '71Jav.

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