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Unread 10-20-2014, 05:43 PM   #1
Lego-26
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Engine swap question

So the bad news is my 258 shredded the #3 piston and bent the crank at the same time. After tearing apart the engine and checking things out Its not worth rebuilding.
The good news is I can pick up an older running 318 engine. The question is this, how hard is this swap? can it be done? I know I will need a conversion bell housing and a little bit of parts matching but after that? Any help would be great.

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Unread 10-20-2014, 06:25 PM   #2
firegod33
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That swap would be a total custom fab job. Not saying it wouldn't be worth it but it won't be easy. There are reasons the Ford 5.0 and Chevy 350 are the most common. Any swap can be performed with enough work and money.
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Unread 10-20-2014, 07:14 PM   #3
82JeepCJ7
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An AMC V8 will bolt in with very few mods. AMC inline 6s and V8s share the same bellhousing bolt pattern. The passenger side motor mount on the frame is a bit different, but overall its a bolt in swap.
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Unread 10-20-2014, 07:23 PM   #4
LumpyGrits
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Stick with AMC, unless you have time and deep-pockets.
LG
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Unread Yesterday, 07:52 AM   #5
CJ7nvrstk
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What they said, AMC. Super easy to do with off the shelf parts.
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Unread Yesterday, 10:38 AM   #6
TIPPEDITOVER
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Having done the SBC swap myself, I must agree with what the others said about cost and time. If you want to keep cost down and do minimum fab work stick with AMC.

There are companies that sell TBI fuel injection for the AMC engines, but there again the cost issue comes up.

However, that being said, there's nothing like electronic fuel injection when you are at 7,000 ft elevation and climbing a ridiculous steep trail or off camber so far you're praying it doesn't tip. Last thing you need is the engine to quit in that moment because it flooded or starved for fuel.

I'm an advocate for fuel injection, if you couldn't tell. No matter what happens, don't get discouraged and get that Jeep back on the road.
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Unread Yesterday, 09:43 PM   #7
82JeepCJ7
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Q-jet.. Just as good as EFI at 1/10th the cost.
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Unread Yesterday, 09:57 PM   #8
dg6772
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I disagree, the fuel injection is way better. Not that a Q-jet is bad,I've had plenty but I am much happier with the tbi. Once understood,and using the obd1 system; you can put it on just about anything out there. I will be helping a friend put a system on a 304. All salvage parts. Keeps cost way down......

Btw computer,wiring and sensors....25 bucks total.....

Dave in Muskegon using Jeep Forum App
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Unread Yesterday, 10:14 PM   #9
TIPPEDITOVER
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I've heard from a lot of different folks that the Q-Jet is a great carb and works great offroad with the angles without flooding or starving. I don't disagree. I don't have personal experience with it.

I do have extensive experience with my factory OEM TBI system and I can say is it's the last thing I think or worry about on my Jeep. I don't worry about keeping my air/fuel in tune. I don't have to. It does it on it's own no matter the temp or barometric conditions.

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