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post #1 of 9 Old 02-12-2002, 08:08 AM Thread Starter
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Unhappy BASHING 304S

I have been reading opinions on here and i dont understand why people would rather go with a 360.Maybe im green on this since i just put a 304 in my 83 cj7.I havent run her on the road or on the trails since my resto is almost complete and i dont even have the driveshafts on her yet.I bought the 304 for $350.00 she runs great.Did i make a wrong choice in motors?I plan on doing tellico and other mountain trails.I swapped the 258 for the 304 for both torque and horsepower.Im not looking to break land speed records just a strong motor for the trails and rock crawling.whats wrong with this motor?

83 cj-7 258c.i., 727auto, d300, d44 front, d60 rear
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post #2 of 9 Old 02-12-2002, 10:17 AM
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I am still somewhat new with this board but after about two months it seems that people just have a very strong belief in their chosen motor. If you got a good deal and wanted to put a 304 in it then you will be happy. I decided to rebuild my 258 as i wanted to keep my jeep as stock as possible. it just depends on what you like.

83 CJ7 w/remanufactured jasper 258 I6 w/t-5, Weber carb, new exhaust, PS, PB, 2 1/2" Lift, 31" BFG's, herculined interior and s**t brown paint job (for now) "in to deep..but thats when it starts getting fun"
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post #3 of 9 Old 02-12-2002, 12:07 PM
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I have a 258 and I've driven a stock CJ8 with a 304. Don't worry about your decision you didn't do badly but hte 304 is not the best choice. I really enjoyed driving the 304 and you will too. here's the knock on the 304 vs the 258. the 258 will have more torgue at lower rpms than the 304. The 304 will generate it's torgue around 2200 rpm while the 258 is strong at 1500-1800. This low rom torgue gives the driver more control in tight situations. In the future you could change your cam from the 2200-5500 range to a Crane with 1500 - 4500. the cam costs $150.00 you will sacrafice highway performance but that will help with the low rpm torgue. changing gears in the axles will help too. no matter what you do no engine is better at generating torgue than an inline( 4 or 6). Even after I say that I am in the process on buying a 401 V8. I will conceed the 258 would be the better choice But I'm getting what I want. a 401 is over kill!!! I could break stuff because that engine is so strong.

about the 360. the 360 is a little better than the 304 but it has the same problem. you must generate RPMs to get the torgue.
I have friends that have the 360 and the 304 and they all like it.
in case you didn't know the AMC line starts with 304 then 360 then 390 and finally 401.

Finally, a running 304 for $350 is a very good deal so you didn't lose anything.

Have fun and enjoy that engine

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post #4 of 9 Old 02-12-2002, 02:36 PM
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I am currently replacing my stock 130 hp 304 in my 1979 Jeep with a rebuilt 230 hp 360 from a 1986 Wagoneer. Some 304's were built in an era of 150 hp Corvettes and really are wimpy.
The 304 develops 224 lb ft of torque @2200 rpm and the 258 develops 196 lb ft of torque @1800 rpm. Many of my friends have the 258 and are happy with it - for me the V-8 is still the best for the wheelin' I like to do and that little extra grunt has proven itself in the sand over the 258 everytime, plus it sounds waaaay cooler!
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post #5 of 9 Old 02-12-2002, 02:38 PM
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Don't let these guys get to you . I run the 304 and sure it takes some rpm to get to the torque range,but you'll get there just like everybody else . And you'll sound alot cooler all the way ! If you made a desision that makes you happy thats all that matters. And if all else fails you can chain your jeep to an inline 6 jeep and tow him around! JIM

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post #6 of 9 Old 02-12-2002, 11:12 PM
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did you know that 304-401 are all externally the same!!! 360 has a longer stroke i do believe, biger bore etc, thus giving it a bit more power and potential, but that doesn't mean the 304 isn't a great motor. I've got one and love it. horsepower tv just built a 401 w/497 ft/lb and 481 hp. roller rockers, cam, 10:1 pistons and mostly bolt on accessories. Example is given to show that amc v8's are capable of lots of power w/out major changes. i.e. no need for aluminum heads, stroker, etc etc.

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post #7 of 9 Old 02-12-2002, 11:47 PM
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One thing to add, most want to increase there performence by adding a v-8. The 304 isn't much stronger than the 258. The 360 will almost double what the 258 has. Same thing with Chevy, why build a 305 when a 350 will do better.

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post #8 of 9 Old 02-13-2002, 10:31 AM
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I built a 304, used all edelbrock perfomer parts, doesnt "perform" like i thought it would but im very happy with it, alot has to do with your gearing. my jeep with the t-5 absolutly flies on the highway (way to much, i dont even touch 5th for fear it will stall)but in low range it creeps along nicely (i can get out and walk beside it at idle)
my buddies 258 powered jeep is just the opposite slow on the road and fast in the woods. hes swapping the gearing soon though so we'll see how much a difference that makes.
The 304 sounds awsome DOES have a lot more snap than any 258,(still a good motor though) and has gobbs and gobbs of torque that you can get out of whatever gear you happen to be in without shifting to a higher gear to blast thruogh to the other side of the mud hole or crank up that hill climb and then need down shift again to restore the torque when your speed peters out!
And it doesnt snap all the drivetrain behind it.
I love my 304! its in a jeep not a dragster!

1982 cj7. Frame off. shell valley kevlar body, stainless hinges, Bestop seats and supertop, KC titanium lights, Homemade swing out tire carrier with spare front wheel bearings/hub, Built 304,DUI,Edelbrock shorty headers with dual stainless 21/2 tubes into incynerator cans 21/4 dumped out the back,Edelbrock 600cfm, performer intake and cam, Borgeson lower column, Centerforce clutch, NV-4500, Dana 300 w/custom built twin stick, Homade 1/4" steel skid plate, 2.5 soft ride w/ 1" shackle lift, 33x12.5 mtr's. Stainless fuel and brake lines, Braided hoses. more...
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post #9 of 9 Old 02-13-2002, 10:38 AM
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Originally posted by RickCJ7:
One thing to add, most want to increase there performence by adding a v-8. The 304 isn't much stronger than the 258. The 360 will almost double what the 258 has. Same thing with Chevy, why build a 305 when a 350 will do better.
Exactly! More power!
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