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Unread 05-01-2013, 07:36 AM   #1
JustRight
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302 or 305?

I just bought a 1987 Jeep Wrangler a couple days ago and want to swap for a V8. Looking for opinions as to which setup I should go with as far as engine, tranny, tcase and diffs to handle 35" tires.

Or maybe a 318?


Last edited by JustRight; 05-01-2013 at 08:13 AM..
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Unread 05-01-2013, 09:07 AM   #2
Morris4x4Center
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Ford302 parts are SUPER CHEAP and easy to find. Plus a 302 can make great torque with little mods.

If you have the cash, 5.3L L33 is a great idea too. The T56 transmission would run a pretty penny though.
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Unread 05-01-2013, 12:58 PM   #3
ratmonkey
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of the three you listed. the 302 is the better choice. it's also a smaller motor than the others. the 305 is a boat anchor. the amc 318 blows goats, the dodge carb 318 isn't far behind, and i doubt you want to go fuel injection based upon your other choices so the magnum is probably out.

just be sure to buy an offroad carb if you want to be able to do anything more challenging than a flat field. regular carbs don't like off camber or hilly situations.
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Unread 05-01-2013, 07:51 PM   #4
yjtyler
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i would say either a 302 or a 350. generally ford engines are more expensive to build but if ur looking for just a standard rebuild, they would be about the same price. keep searching craigslist for engines. i picked mine up for $500 bored .030 over with a few thousand miles on the rebuild. also transmission choices is a reason i went chevy. ford has the c4 and 4 speed. i think thats about it that is a relatively small size for a jeep. the e4od is a big trans that i donot think will fit well. the chevy has th350, th400, 700r4, nv3500, nv4500, etc. then to t cases. the chevy np231 can be split and made a hybrid with the jeep or go up to the np241. ford has big and heavy cases like the dana 20 and 205 which for strength is great but they weigh like a hundred lbs a piece. on to axles. the front 30 can live if ur not real hard on it ( mine is still together) but the rear is going to need upgraded. best axle is the 8.8
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Unread 05-02-2013, 10:49 AM   #5
JustRight
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I found a 1985 Ram charger that I can buy for $750. Has 318 and 360 blocks. Automatic transmission, transfer case and both differentials with lockers. If I go with that, I will have to decide 318 with more rpm or 360 for more HP.

Any thoughts on this? Thanks for all the input.
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Unread 05-04-2013, 06:50 AM   #6
yjtyler
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here i found this for u this is basically EXACTLY what u said in ur last post.

http://supermotors.net/registry/media/606081_1 (the pic is really big!)
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Unread 05-04-2013, 07:05 AM   #7
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The Chevy engine is always the better choice. A 305 has the same crank as a 350. It'd be a better torque engine than a 302.

Personally, there are plenty of 350's out there, so why so small?

But there is nothing wrong with a 305. It's not a popular choice, but there's nothing wrong with it.

Yeah, you can do all sorts of stuff to a 302. Once the aftermarket started basically making Small Block Chevy stuff that fit a Ford, the 302's became a viable performance option.

Or you can just put what the 302 wishes it was in it to start with. You'll have even more options in your build, can find more parts for it at more places, and it's the most successful race engine of all time. What's not to love?
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Unread 05-04-2013, 07:06 AM   #8
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Quote:
Originally Posted by JustRight View Post
I found a 1985 Ram charger that I can buy for $750. Has 318 and 360 blocks. Automatic transmission, transfer case and both differentials with lockers. If I go with that, I will have to decide 318 with more rpm or 360 for more HP.

Any thoughts on this? Thanks for all the input.
If you were going to go this way, always go for the bigger engine, if they're both stock.
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Unread 05-04-2013, 04:40 PM   #9
jhedges15
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That ram charger has the vacuum actuated front axle. It's problematic and kind of a pain to deal with.
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Unread 05-06-2013, 11:26 AM   #10
foggybottombob
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I had an 82 K5 size Jimmy with a 305 in it. Like my friend said, it would not pull a greased string out of a monkey's butt.
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Unread 05-10-2013, 03:35 PM   #11
Wheelin98TJ
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Quote:
Originally Posted by Pacfanweb View Post
The Chevy engine is always the better choice. A 305 has the same crank as a 350. It'd be a better torque engine than a 302.

Personally, there are plenty of 350's out there, so why so small?

But there is nothing wrong with a 305. It's not a popular choice, but there's nothing wrong with it.

Yeah, you can do all sorts of stuff to a 302. Once the aftermarket started basically making Small Block Chevy stuff that fit a Ford, the 302's became a viable performance option.

Or you can just put what the 302 wishes it was in it to start with. You'll have even more options in your build, can find more parts for it at more places, and it's the most successful race engine of all time. What's not to love?
Back in the late 80s/early 90s, stock 305 Camaros were running 15-16 second 1/4 miles.

Stock 302 Mustangs were running 14s.
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Unread 05-10-2013, 08:51 PM   #12
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Yeah ford has always done more with less. 302s compared to 350s, 351s compared to 400s. Old 429s compared to 454s until ford said screw it were done here with a 460 as far as trucks go in the 70s crunch.

As for comparing a 305 to a 302 your average 305 wasrated at 170 hp in 89. And from 85 up all 302s had 215,225 hp. Only rarely did 305 break 200. On top of that several years had oil issues.

302s also mount to the t18/t19 with dana 20(drivers side drop) which is just about the most solid factory combo you can put in a jeep.

And really a ford HP dana 44 front is a great axle option along with a 9"rear. If you can find a complete donor. However a 302 at that year will likely be 70s f@#$%^ so you would be well off to find a 70s ford 4spd 4x4 with a bad motor (maybe $500) and a find a crown vic 302(maybe $200-300) from the late 80s. Take or leave the fuel injection doesnt matter just your preferance.

And you will have every drivetrain part necessary to run 35-38 inch tires, and a engine lazily making 200+ hp with 275hp a couple bolt ons away. While parts are generaly 5-10% more expensive than chevys they(302) are more compact and have a huge aftermarket.
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Unread 05-10-2013, 09:08 PM   #13
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Being a completely unbiased person, there is only one appropriate engine swap for an older Jeep.









Old school (or semi old school-Vortec heads work great for stockers) small block Chevy. It will give you the most options and the most torque for the buck. As noted above, nothing wrong with a 305 and an FI version would work very well in a lighter flatty. A 307 is also relatively small bore, long stroke, or if you are into tinkering, put a 350 crank in the 307 block and you get a bigger version of the 305 at 328 ci. Again, as with the other posts-a 305 takes the exact same space and is the same weight as a 350 and I suspect a 350 rebuild kit would be even less than one for a 305-no reason not to go with a 350, or better yet, a 383. In my experience, there isn't much difference in the mileage if all are set up well.

I would be using a stock aluminum bell, 11" clutch with a steel flywheel, SM465, and the Dana 300. The older Mopar's may be a better choice than the AMC's for no other reason than parts availability but personally, a Ford or Chevy small block is the way to go-and my preference is noted.
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Unread 05-11-2013, 09:20 AM   #14
Pacfanweb
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Quote:
Originally Posted by 74Maverick View Post
Yeah ford has always done more with less. 302s compared to 350s, 351s compared to 400s. Old 429s compared to 454s until ford said screw it were done here with a 460 as far as trucks go in the 70s crunch.

As for comparing a 305 to a 302 your average 305 wasrated at 170 hp in 89. And from 85 up all 302s had 215,225 hp. Only rarely did 305 break 200. On top of that several years had oil issues.
Um, in 1989 the Z-28's top 305 had 225hp. So they were always neck-and-neck with the 302's. Always. And they cars ran about the same times, too....really depended on the driver, but the Mustang's real advantage was less weight....it sure as hell wasn't the motor.

Also, those late-80's 302's had a horrible problem burning oil. Ford put low-tension rings in them for more power, and they actually had us telling people that using 1 quart in 500 miles was acceptable, and considered "normal".

302's in trucks had 185 HP in the late 80's, btw.

And the 460 came out about the same time, if not sooner, than the 454's and 455's did, which was 1970. They never could compete, because they were simply inferior designs...even though the 429/460 and 351 Clevelands were copied from the Big Block Chevy's. Even the vaunted Boss 429 engine was a turd....those cars couldn't go under 14 seconds in the 1/4.

The aftermarket for the 302 is vast now. Basically, they tried the make the head designs as much like the Small Block Chevy as possible, and they were successful, so you can now build a lot of power from them. But not more than you can from a Small Block Chevy. Best you could hope for is to equal one, and even that will cost you more.

But back to the topic...a 302 or a 305 in a basically stock Jeep is going to be about the same. The potential of either is based on your wallet.
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Unread 05-11-2013, 09:44 AM   #15
Wheelin98TJ
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^ Guess I remember the 305 differently.

It was a dog, or should I say "boat anchor".
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