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Unread 07-18-2010, 10:35 PM   #1
Taking2long
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Thoughts of 283 Chevy in a 84 CJ

Long story kind of short, I have a friend wanting to unload an engine from a parts car he isn't using. Its a rebuilt 283 from a 62 Impala 4 door. He has a Biscayne 2 door that he's built and got the car for cheap for parts except he doesn't need the motor. My story is I was going to buy a Weber carb because my crappy jeep carb sucks. I can get this motor for about the price of the Weber but know that I need a lot more other parts to make it work. Budget is important but I have SBC V8 jeep dreams. My questions is 2 part. How well will this motor do in a 84 CJ compared to the inline 6 and the other is what Transmission does the 84 CJ7 Renegade with inline 6 and 5 speed have and will it hold up with the chevy motor? Or is this something else to invest in if I go this route. Sorry for the long story but just wanted all the info out there before I get feedback.

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Unread 07-18-2010, 10:49 PM   #2
Pacfanweb
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The wimpiest 283 ever was 185hp, which just crushes the 258. If you mod it a bit, which is very easy to do and almost a law with an SBC, you can easily get over 300, which a 258 would never dream of for twice the money.

So yes, a 283 is a great upgrade over a 258. Now, to ME....if I'm going to the trouble of an SBC swap, I'm going for bigger than a 283. But, even if you go ahead with this engine, any SBC will fit right in its place later on.

Your tranny....is a T-5. It "might" live awhile behind the 283, if you're really easy with it, but not for long if you're going to wheel it or be doing burnouts and catching 2nd gear all the time.

Other things: You'll need motor mounts, exhaust, radiator, accessories/pulleys if the engine doesn't already have them, flywheel, adapter bellhousing, etc.

Check Novak or Advance Adapters for more detailed info.
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Unread 07-19-2010, 12:29 AM   #3
80cj
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You may be disppointed because the 283 has a short 3" stroke and the torque comes in at a higher RPM than the 258. Horsepower ratings on those old engines are gross whereas later engines (probably 72 on up) are net. One thing a 283 will do is rev. Some early 60's 283's were rated at 170 HP. I had a 67 283 in a CJ-6 and it was factory rated at 195 HP.

Last edited by 80cj; 07-19-2010 at 01:26 AM..
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Unread 07-19-2010, 06:32 AM   #4
Mister 4x4
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I swapped to a V8 after driving with my 258 for 13 years. I will never go back tot he 6 at this point because the Chevy motor sounds amazing and is very easy to get power out of it. I love my V8.
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Unread 07-19-2010, 07:59 PM   #5
Taking2long
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I plan on using this for mostly beach use and cruising to and from. Here is what I got so far. Bought it rolled still running with no rust except by one spot where the roll bar attached to the floor. Cut it out and welded in new metal. Just seem to always have to try adjusting carb. My brother is a mechanic and he rebuilt it about a year ago and it did okay for a short time. Done nutter bypass with his help and that helped a little but V8 seems way to go. Just tired of messing with this carb and why not go V8 at this point. And I haven't really go back to him but I believe he has everything from carb to oil pan, including flywheel.
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Unread 07-19-2010, 08:06 PM   #6
Taking2long
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Will stock chevy exhaust manifolds fit? Oh and pretty sure my brother can fab motor mounts for me. He's done it on some other swaps before and they worked great.
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Unread 07-19-2010, 08:14 PM   #7
crzdmnky
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I dont see the point. Get a cheap 350 off of Craigslist. They come cheap enough around here. I mean if your going to be adding the weight and all the other parts for a V8 swap, why not do it right from the beginning? I mean 283's are cool little engines. But it just lacks torque, even with a RV cam. It will have Horsepower tho. This is my take on it. A v8 is a v8 none the less, but I like to think of 5.7 liters instead of 5.2 Liters. Plus you wont be saving any on gas mileage.

Stay away from Rat motors, they are to big of V8s :P
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Unread 07-19-2010, 09:09 PM   #8
82JeepCJ7
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Funny part is, a GM V8 weighs less than a AMC inline 6.

The T-5 wont last long. I grenaded one with the 258.

The Dana 300 will be fine. The AMC 20 rear axle will be the next domino to fall. I went with a AMC 360 swap on my CJ7. It bolts right in, no engine mounts to adapt. Uses the same radiator (many CJs came with the same radiator as the V8 powered Jeeps did). I swapped in a T-18 4-speed to handle the power. I eventually swapped out the Warn Full Floated AMC 20 for a Dana 60 and the Dana 30 for a high pinion Dana 44.
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Unread 07-19-2010, 09:16 PM   #9
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Just get a V8 if you're going to go out of the way to take out the 258 a sbc 350 is a very good choice, great performance and cheap aftermarket support.
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Unread 07-19-2010, 09:18 PM   #10
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Its a good little motor. Check the heads on the 283. I had one a long time ago in a Willy's pick-up. Because of its age, the heads were not tapped for any front accessories. You can get aftermarket bracket, but they look goofy. Just something to look into.
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Unread 07-19-2010, 09:34 PM   #11
Pacfanweb
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Quote:
Originally Posted by 82JeepCJ7 View Post
Funny part is, a GM V8 weighs less than a AMC inline 6.
They're close, but I'm pretty sure the SBC weighs slightly more, at 575 lbs. Put some aluminum heads on it and you might have a contest.

One thing the SBC is, however, is shorter. So even though it's heavier, the weight isn't as far forward.
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Unread 07-20-2010, 12:09 AM   #12
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Go with the 283, if you can get it that cheap i'd do it. I wouldn't be worried about torque, it'll have gobs more than that straight six, and be super fun with that high revving short-stroke. People are always talking about RV cams, torque and stroker motors, but fact is it's a lightweight jeep, not a big mud truck with 40" tires. for an everyday driver it's nice to have that higher rpm range on the highway, dunes, or in the mud. Unless I had monster tires or were rockcrawling I wouldn't worry about torque. I'd maybe stick an NV3550 5-speed behind which would be super fun rattin around banging gears through. Or use an sm465 4-speed, no overdrive and 1st gear is non-synchroed and too low for the highway, but its cheap and bombproof. And having that higher rpm range would be nice with no overdrive. My brother has a 327 sbc in his CJ with 36'' tires 4.10 gears and the sm465 and it'll roast those tires no problem and is scary fast, with 33'' tires it'll snap your neck..
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Unread 07-20-2010, 02:39 PM   #13
crzdmnky
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Quote:
Originally Posted by Pacfanweb View Post
They're close, but I'm pretty sure the SBC weighs slightly more, at 575 lbs. Put some aluminum heads on it and you might have a contest.

One thing the SBC is, however, is shorter. So even though it's heavier, the weight isn't as far forward.
Is this a good thing or a bad thing in a jeep Pacfan, in your opinion?
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Unread 07-20-2010, 04:11 PM   #14
82JeepCJ7
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The closer to the center of the vehicle you can keep your center of gravity, they better.
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Unread 07-20-2010, 05:32 PM   #15
Pacfanweb
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Quote:
Originally Posted by crzdmnky View Post
Is this a good thing or a bad thing in a jeep Pacfan, in your opinion?
Good. Agree with the post above mine. CJ's with 258's are less nose-heavy with an SBC, despite the extra weight.
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