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Unread 04-23-2013, 12:40 PM   #1
78FordF150
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School me on GM LS engine's.

I'm thinking about doing a 5.3 swap in my CJ7. I currently have a 360 and NP 435 tranny. I have done a 350 swap before, so this isn't totally new to me. But I know nothing about the LS motors. I would like to keep my 435 so here goes:
Motor mounts
Tranny adapter
Inlet and outlet differences on radiator.
What year engine to look for.
Wiring and accessories to get
Fan
Flywheel

Thanks

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Unread 04-23-2013, 01:20 PM   #2
Keith_b00ne
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Mounts and adapters can both be found from Novak and Advanced Adapters. I recommend looking at the Novak website. They have a lot of information on this particular swap. I forgot the year, but in the mid 90's many of them went from cable to wire throttle. I think in the Vette's it was 95/96 was when they made that transition.
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Unread 04-23-2013, 01:27 PM   #3
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http://www.novak-adapt.com/knowledge...ine_mounts.pdf
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Unread 04-23-2013, 01:32 PM   #4
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http://www.novak-adapt.com/knowledge...ion_III_v8.htm
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Unread 04-23-2013, 05:13 PM   #5
78FordF150
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Keith thanks for the links.

Is a LS1 5.7 just a Vortec 350 with the newer style injection system that came on the 5.3.

Does any of the 5.3's come with a throttle cable instead of drive by wire?
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My NP435 install [url]http://www.jeepforum.com/forum/f8/time-tranny-swap-upgrading-np435-1487201/[/url]
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Unread 04-23-2013, 05:18 PM   #6
mattamd_xp
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Quote:
Originally Posted by 78FordF150 View Post
Keith thanks for the links.

Is a LS1 5.7 just a Vortec 350 with the newer style injection system that came on the 5.3.

Does any of the 5.3's come with a throttle cable instead of drive by wire?
LS1 5.7 is an entirely new motor

99-02 4.8, 5.3, 6..0 truck motors all came with drive by cable instead of drive by wire.

Check out this thread on Pirate for all you'd ever want to know about the ls series motors:
http://www.pirate4x4.com/forum/jeep-...5-3-jeeps.html
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Unread 04-23-2013, 07:02 PM   #7
78FordF150
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Quote:
Originally Posted by mattamd_xp View Post
LS1 5.7 is an entirely new motor

99-02 4.8, 5.3, 6..0 truck motors all came with drive by cable instead of drive by wire.

Check out this thread on Pirate for all you'd ever want to know about the ls series motors:
http://www.pirate4x4.com/forum/jeep-...5-3-jeeps.html
Thanks for the link. I'm up to page 10 185 to go.
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Unread 04-23-2013, 08:18 PM   #8
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Quote:
Originally Posted by 78FordF150 View Post
Keith thanks for the links.

Is a LS1 5.7 just a Vortec 350 with the newer style injection system that came on the 5.3.

Does any of the 5.3's come with a throttle cable instead of drive by wire?
LS is a whole new series than the old SBC. no interchangeable parts AFAIK

early models, pre 2003 were cable driven not fly by wire.


years to avoid, 01-06 4.8's and 5.3 unless you plan on swapping heads, or at the very least pull a valve cover and check the head castings before buying a motor. the aluminum heads on the 01-06 4.8's and 5.3's were outsourced to a company called castech. they are known to get hairline cracks in them, my 03 5.3 did. just do a little search, you can find just what to look for on them.
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Unread 04-23-2013, 08:30 PM   #9
78FordF150
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Are all the heads on 01-06 aluminium?

When I head to the salvage yard what all do I need to Get from the donar truck.
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Unread 04-24-2013, 03:30 PM   #10
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all 4.8 and 5.3 heads are. 6.0 are cast iron.
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Unread 04-24-2013, 05:36 PM   #11
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Quote:
Originally Posted by underpowered View Post
all 4.8 and 5.3 heads are. 6.0 are cast iron.
Only 99-00 6.0's had cast iron heads. Everything 4.8, 5.3, 6.0 from 01 on had aluminum heads. There are also I believe 3-4 different castings for the heads and only 1 of them had problems cracking.
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Unread 04-24-2013, 09:07 PM   #12
78FordF150
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I'm up to page 22. Lots of info there. Thanks for the info on the heads.
I'm guessing a 00-01 would be a good year to look for.

What all should I get from the salvage yard.?


Is the bell housing bolt patern the same as a old school 350?
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Unread 04-25-2013, 02:51 PM   #13
mattamd_xp
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Quote:
Originally Posted by 78FordF150 View Post
I'm up to page 22. Lots of info there. Thanks for the info on the heads.
I'm guessing a 00-01 would be a good year to look for.

What all should I get from the salvage yard.?


Is the bell housing bolt patern the same as a old school 350?
You should get the complete engine along with the wire harness/PCM (computer) and I'd try and get the O2's as well if you can, even if they're bad you can use the P/N's to order replacements as there are several different ones used depending on what vehicle the harness is out of. I grabbed the fuse block when I pulled my setup even though I'm not running it as it has labels that help with knowing what wires go where.
If you get the drive-by-wire you'd need the TAC module along with the throttle pedal assembly, you don't have to worry about any of that with drive-by-cable.
The bell-housing pattern is slightly different, 1 boss is in a different location, but many people have bolted up transmissions from behind SBC without having any issues.
If you're not into messing with the wiring yourself, there are many different companies that offer new harnesses, and several that will re-work your stock harness to stand-alone with only a few wires to hook up. New harnesses can be very expensive, re-working your harness is usually only $2-300. Either way the computer will need to be reprogrammed which ranges from $75-200 depending on who you go to.
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Unread 04-25-2013, 08:41 PM   #14
78FordF150
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Mattadm that's what I'm talking about. I hadn't thought about o2 censors.

What about the fuel pump from the donor truck. Or should I get some kind of aftermarket pump.

I'm thinking I can get a bell housing from Advanced Adaptors to go from sbc to ford np435. And still retain my factory clutch linkage.
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Unread 04-27-2013, 07:17 PM   #15
underpowered
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Quote:
Originally Posted by mattamd_xp View Post
Only 99-00 6.0's had cast iron heads. Everything 4.8, 5.3, 6.0 from 01 on had aluminum heads. There are also I believe 3-4 different castings for the heads and only 1 of them had problems cracking.
my mistake, but the 6.0's were never outsourced to castech and do not have the same issues as the 4.8/5.3 castings do.

there are multiple castings, as i stated you can check under the valve cover, on the head you can look for the castech symbol (looks like a battery) if it is castech, it is junk.
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