Fuel Injection and Engine Rebuild Questions

For everything related to using Fuel Injection in an FSJ.
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Fuel Injection and Engine Rebuild Questions

Postby Santeh » Sat Oct 21, 2017 7:41 pm

Hello All,

After quite a bit of searching, queries, and discussions I did indeed end up with a 1978 Cherokee SJ. However, the Jeep came with a number of issues that I was unaware of and I have already rebuilt the front end and replaced the water pump and alternator. However, the 360 V8 engine has many leaks (power steering, pan gasket, torque converter, and several oil) yet while I am told the engine is strong it may need to be rebuilt. Along that line I have a friend that has a nice, fully working year 2000 5.7L V8 LS1 that he is willing to give me. I am curious what you all might feel both about the performance and power of the LS1 over the AMC 360 V8, as well as resale value of the 1978 Cherokee SJ if the original 360 V8 engine with approximately 126,000 miles on it is replaced with the much newer LS1?

Yet if I do keep the 360 V8 engine I would also have to deal with the fact that the SUV currently likes to struggle to start moving when stopped at a light. This is, perhaps due to the carburetor, not surprising and does get better once the SUV warms up and I go slow after a light turns green. Along with possibly tearing down the 360 V8 and fixing any found issues along with the many leaks, I was told that the SUV would benefit greatly from replacing its current Edelbrock carburetor with a FiTech Go EFI 400 HP fuel injection system with a FiTech delivery system. I was curious what you all might think of this, especially in a hot Florida environment?

Thank you all!

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Re: Fuel Injection and Engine Rebuild Questions

Postby Cheapthrills » Sat Oct 21, 2017 7:57 pm

I vote ls1 you will roughly double your power but there are a lot of costs behind that swap especially if you have it done in shop. At 130k on the clock engine "should" be in good shape IF IT WAS MAINTAINED. oil leeks happen with AMC engines they are prone to them. As far as sale of the AMC it's few hundred, it is used with no warranty and unknown history (i.e. run out of oil ever, blown head gaskets ect. Ect ).

I'm rebuilding one of my 360s for one waggy and prepping an ls swap in another.

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KJ Ryu
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Re: Fuel Injection and Engine Rebuild Questions

Postby KJ Ryu » Sun Oct 22, 2017 7:08 am

Don't use the FITech fuel command center, if you go EFI. Either put a pump in-tank or use a good in-line pump.

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 2v304, T18, D20, 37x14s, SOA & SF on tons, still ugly. not running
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s, DD! :fsj:

Mars wrote:One man's trans leak is another's penetrating oil :D

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Re: Fuel Injection and Engine Rebuild Questions

Postby csuengr » Mon Oct 23, 2017 1:58 pm

To really check the health of the engine, you need to do a compression and leakdown test. If those are good, it would be worth it to reseal the engine.

The last engine swap I did with a free engine still cost me around $900. That was with building my own engine mounts, $40 for a GM to AMC TF727 adapter, and doing the work myself. It's the little stuff that will kill ya'.

If you do keep the 360, a mild cam and a good 4bbl card (EDELBROCK) will do nicely, especially down there in the flat land.
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