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Unread 11-29-2013, 10:08 PM   #16
jeep1000
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1985 CJ7 
 
Join Date: Aug 2011
Location: Austin, Texas
Posts: 337
I kinda want to do this also but mines a daily driver and weekend warrior. Wanted to get an EFI 4.0 and stroke it to a 4.7. Crunched the numbers and it'd be cheaper to do that than a 350, but a 350 has some major horse and torque to it. It's more expensive to put in and the motors are a little more expensive to but from what I hear, it's worth it.

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'86 CJ7, I6 258 four speed manual. See ya on the trails!
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Unread 11-30-2013, 06:52 AM   #17
holliewood61
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1981 CJ7 
 
Join Date: May 2013
Location: Peterstown, wv
Posts: 840
id find an early 4.6 that had the 2 coil packs and 8 plug wires rather than a later one with the 8 individual coil packs. they seem to be less problematic with less coils to go bad, aluminum upper intake rather than plastic, and they don't pump coolant through the throttle body. also they can be found second hand more easily. ive seen builds where early 4.6's were used with later pi heads. the earlier non pi engines had less dish in the pistons and the pi heads have a smaller chamber so swapping the pi heads onto a non pi engine gives a nice bump in compression and power. the ford modular line is a very good and reliable power plant and it would be cool to see one in a jeep. they can be intimidating because of the ohc setup, but they are quite simple.
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Unread 12-01-2013, 09:59 AM   #18
dn101009
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1986 CJ7 
 
Join Date: Feb 2011
Location: Medford, OR
Posts: 105
Well. I ended up with a 351 for it. I just kinda decided it would be much easier to do than a modular motor. I am not completely saying no to a mod motor, but at this point a 351 is it. Somebody is going to let me borrow a 4.6 in a few weeks. So I may still try and mock it up to see if it will fit. Here is the pics of the 351 and zf 5 speed. They came out of a 89 efi pickup. I will be swapping all efi stuff over to the HO mustang system . I forgot to snap pictures before my nephew and I started taking it apart.
1455173_10100926169321248_513770734_n.jpg   62475_10100926168991908_729981726_n.jpg  
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Unread 12-01-2013, 03:31 PM   #19
Bigmaaty
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1979 CJ7 
 
Join Date: Jan 2013
Location: Brighton, Co.
Posts: 41
Looks like a great project. Good to hear you are getting your nephew exposed to the jeep bug. You are in a great spot, five minutes from town in any direction and you can be on a trail. I miss it, I have two boys who went to North about your age. Keep us posted.
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Unread 12-01-2013, 09:50 PM   #20
dn101009
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1986 CJ7 
 
Join Date: Feb 2011
Location: Medford, OR
Posts: 105
Yeah I will start a thread one of these days dedicated strictly to my jeep. Right now I am just kinda gathering parts. I want to get the engine rebuilt and mocked up in it before I start doing anything else to it. It will be a couple years before I get it up and going. I am in no rush and I am going to take my time.
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Unread 12-02-2013, 02:14 AM   #21
Cutlass327
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1978 CJ5 
 
Join Date: Jan 2009
Location: Massillon, Ohio
Posts: 5,105
So are you going to tune it after swapping over to the Mustang efi? I would probably just go with it as is. Less hassles.
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1978 CJ5 258/T177/D300, '86 D30/D44 WT axles, 'glass tub windshield frame, and fenders, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

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Unread 12-03-2013, 10:54 AM   #22
dn101009
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1986 CJ7 
 
Join Date: Feb 2011
Location: Medford, OR
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I probably wont. I think I am just going to stick some hyperetec pistons in it, a set of gt40 heads (cheap) a cam grind similar to the 5.0 HO, and probably a carb mount intake machined for injectors and an elbow to take a stock style mustang throttle body. As of right now, that is my plan. Plan could change by tomorrow though
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Unread 12-03-2013, 11:51 AM   #23
astrawn
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1979 CJ7 
 
Join Date: Sep 2013
Location: Stockbridge, GA
Posts: 53
I doubt the new modular Ford V8s would fit. They are much wider than 302-351 motors. If you pull one on a newer Mustang they come out the bottom, not through the hood
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Unread 12-03-2013, 12:52 PM   #24
Cutlass327
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1978 CJ5 
 
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So you are planning to run a 351 engine on a 302 EFI system? As far as I know, you will be out of range of the system, unless you swap injectors, MAF, and fine tune it. I know the MAF system is more adaptable to engine modifications, but I don't know if it can adapt to a 49 CI increase in engine size.
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1978 CJ5 258/T177/D300, '86 D30/D44 WT axles, 'glass tub windshield frame, and fenders, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

http://www.jeepforum.com/forum/f8/ri...8-cj5-1223197/
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Unread 12-06-2013, 10:45 AM   #25
dn101009
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[QUOTE=Cutlass327;18216226]So you are planning to run a 351 engine on a 302 EFI system? As far as I know, you will be out of range of the system, unless you swap injectors, MAF, and fine tune it. I know the MAF system is more adaptable to engine modifications, but I don't know if it can adapt to a 49 CI increase in engine size.[/QUOTE

The stock 5.0 mass air efi system will be fine. The 351s only came with the 19 lb injectors. The 5.0 HO system is actually a very good oem efi. It will handle some decent upgrades with out too much problem. It should handle most any as long as the injectors stay the same. Once bigger injectors are needed, then typically is when custom new tunes need to start coming into play.
From what I understand 19 lb injectors should be good to around 300 hp (relative). That's why the Mass air system is in such high demand. The engine tunes itself based on the mass air meter sensing out much the engine is pulling in, relative to how much is going out ( 02 sensor). So the stock ecm will actually take some decent upgrades as long as it is calibrated to whatever injectors are being use.
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