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I am building a CJ7 trailered rockcrawler Dana 60 f/r, 39.5 Boggers, 727,and D300.(100% Off Road Use) I have a 4.0 that is 95% complete I need a cam, fuel pump and oil pump it has all of the fuel injection, computer and an XJ wiring harness. I was planning to run this in the Jeep but I recently found a sweet deal on a midly built 304 with new Edelbrock 650 cfm carb etc.

Given the choice of a stock 6 cyl. fuilie or mild V8 that's carbed which would you choose to run.

Regards

MT
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sounds like to me since you dont drive it every day and its 100% off road use go with the V-8 later on you can put on fuel injection on that engine and you will be so happy!! The 4.0 is an excellent motor but it just wont give you the sound of a V8 and the power either. <IMG SRC="smilies/jeep1.gif" border="0">
 

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Originally posted by The Flem:
<STRONG>v8, but i'd put the stock 2barrel back on it</STRONG>
I have the 4.0/999/300 (4:1 gears) I love it. Never needed any more on the trail I do drive mine on the street so some more HP would be nice. I say go V8 and dump that carb or you'll be sorry.
 

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Originally posted by HighHooder:
<STRONG>go v8, but skip the 304, get the venerable SBC 350. the 304's weight alone makes it less desirable, IMO.</STRONG>

Less desirable than a 350? AMC v8's weigh about 30lbs less than chevy blocks of the same era, and around only 50lbs more than a 258.

I read somewhere that the 390 amc v8 out of a 71 Javelin had the highest horsepower to weight ratio that year.
 

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Fuellie I6 over the 306

Tough call between the 4.0 and the 360 - which are pretty plentiful
 

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The 4.0 puts out more ponies than a stock 304, but not quite as much low-end torque. If its strictly rocks crawling, I think I'd go with the 4.0 strictly because its fuel injected. The 304 will have a little more grunt but carb's suck IMHO.
 

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one word: cubage. the 304 has 62 cubes on a 242. better yet would be a 360. same block as a 304 but with larger pistons.
AMC v8s are torkey as hell, BTW. they're real truck engines. i've heard (never run a 350) that SBCs don't get shit for low end torque; unless you're talking about a 383.

anyway, the answer from my corner will always be to go v8, unless you're making a 242/258 hybrid.

mmmm... 281 cubes of fuel injected inline 6 madness....
 

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go with the 4.0...

it will be cheaper in the long run

it is already FI
 

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go with the v-8, put howell injection later, play with the carb for a little while, there are more mods to build the 304 than the 4.0 also, and amc's are easy to work on, no computer
 

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Originally posted by redruM:
<STRONG>go with the 4.0...

it will be cheaper in the long run

it is already FI</STRONG>

I dont know about that one, you haven't seen my CJ since I put the 360 in it, but it'll run at almost any angle, just a notch under EFI. EFI can be added later too for around $1k. I'll probably be out at Gilmer over Thanksgiving break if you want to check it out, trying to find a group thats going out there one of those days.
 

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Another vote for V8 but skip the 304 and get a 360 with quadrajet or motorcraft carb and just as easy installing a 360 as a 304.

cjboxer
 

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Originally posted by WillyPete:
<STRONG>i've heard (never run a 350) that SBCs don't get shit for low end torque</STRONG>

i dont know exactly what you have been
<IMG SRC="smilies/smokin.gif" border="0"> , but if you think that a CSB does not have torque, you are crazy....
 

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Originally posted by AGGIECJ-7:
<STRONG>i dont know exactly what you have been
<IMG SRC="smilies/smokin.gif" border="0"> , but if you think that a CSB does not have torque, you are crazy....</STRONG>
I agree, I've had a 3 Jeeps with 5 different engines.

The first Jeep I had was a CJ-5, 3 Speed Standard w/ a 304 -- granted, it was built by the previous owner, but it had almost no low-end torque. It would stall off-road all of the time if I let the RPM drop below 1200-1500. Essentially it had way more cam than needed. I sold the 304 and put in a rebuilt 258 (and T-176 4-speed) using some weird 2 barrel carb that had a primary and a vacuum secondary. I could put the bumper up against a wall and let the clutch out in 1st gear low range and it would just slowly chirp the tires.

The next Jeep had a 258 from an '87 Wrangler, it worked well until I burnt 2 pistons on some bad gas in Panama. When I got the Jeep back to the states, we put in a stock SBC. That engine would idle so slow going over rocks that you could literally hear each individual cylender fire. I had 3 problems with the carb on this however: 1. When it got hot outside (I live in Az, that's like 6 months out of the year) the gas would boil in the float bowl -- adding a plate helped prevent this vapor lock, a little. 2. When vacationing in Colorado, at high altitudes, it suffered a significant loss in power -- creating a small vacuum leak helped. 3. On long, steep hills, the float bowl would run out of gas -- nothing really helped this, although we did adjust the float to keep as much gas in the bowl as possible.

My current Jeep I bought came with a 350TBI already installed, I've sat talking on hills steep enough to drain most carbs' float bowls and that fuel injection just keeps it running. In Colorado, I can't even tell that I'm at 13,000 feet -- it just keeps on running just like it does at 1,000ft. The only thing I carry is a spare electric fuel pump, just in case I need it.

- Mike
 

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the 304 would offer minimal power gain and not do as well in rough crawling. If you don't think you need more power then a 304 get the 4.0, if you really what a decent amount of power your gonna have to get something other then these two choices. 304's arent necaserily bad engines you just can't expect much more out of them then stock, one good reason is they have tiny cylinder head ports. I say get a tbi350 and have the best of all worlds
 

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My vote is for the 4.0 with fuel injection. The engine is mostly bolt in but the 304 would also be pretty much a bolt in . Both will require exhaust mods but it will be much easier to adapt your current 6cylinder exhaust to the 4.0. The 4.0 will require fuel system mods but will run at any angle including upside down. cooling will be much easier with the 4.0 than any of the V8's. A downside to the 4.0 will be setting up the wireing harness and not having a big mess.

by the way I have a 93 Cherokee with the 4.0
 

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The 4.0L I have in my tj kicks the crap out of the 304 I had in my cj I just sold. The cj had 33's and the tj has 35's and the tj has way more torque and horsepower. If you go v-8 make it worthwhile and go with a 383 chevy fuel injected.
 

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Well I won't tell you to go 350TBI, or AMC 360 (although these would be better options) because you asked about the 304 or the 242. Between these two I'd go with the 242 (4.0). It is fuel injected already, makes 230 lb/ft of torque, and over 150 hp... not a lot, but enough for crawling. If you want more you can always swap the crank for a 258 crank. Then you'll get a lot more power. Go with the fuel injected engine... it's got close to the same amount of power, is easier to cool, and is fuel injected... you'll never have to tune it so don't worry about that...
 

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I just took out my 304 that was balanced, blueprinted, bored .040 over, ported 401 heads, .262 cam, etc etc etc... it only had about 6000 miles on it. why?? the same reasons you listed.. it is mostly a rock crawler..I trailer it where ever i go. I have a 60 front and a 14 bolt rear and a tf727 with a dana 300 and 4.56 gears.
i'd be hard pressed to decide between an amc 401 and a fuel injected 2.5 but between a 304 and a 4.0 theres no question...i bought a 4.0 yesterday.
 
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