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GM Crate engine/LS3

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Old Mar 9, 2013 | 10:15 PM
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Default GM Crate engine/LS3

Hello everyone.

I am considering adding this GM LS3 engine to my 2000 vert (480 HP).

http://www.jegs.com/

Item #'s 809-19258768K and 809-19258768 without controller



My engine has only 19,500 miles on it and is in great condition; what would this engine be worth to the installer?

You will notice there are two versions listed on this link. One includes a new controller(??) and wiring harness, etc for an additional 1200.00.

Is this version necessary or can I just go with the complete engine and use the corresponding parts from the LS1.

I prefer normal aspiration instead of Supercharging or TT.

Please advise, Thank you.

Last edited by bontrager; Mar 9, 2013 at 10:22 PM. Reason: won't accept complete link
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Old Mar 10, 2013 | 03:59 AM
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I'm pretty sure the stock LS1 controller parts (maf, ecm etc) won't work with the LS3. The
link describes what's included. Hopefully someone who's done the conversion before will chime in..
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Old Mar 10, 2013 | 08:55 AM
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2000 LS1 worth about $1500 if that.

there is a LS1 converter that can go on the LS3 engine
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Old Mar 10, 2013 | 11:48 AM
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Your LS1 PCM will work, but will obviously have to be reprogrammed for the new engine. You will need this for converting the 58x signal to the 24x signal: http://www.lingenfelter.com/mm5/merc...3#.UTVbvRzrzRE

Here is the page to some adaptor harnesses. youll need map sensor harness, injectors, cam extension, mass air if you change to a card type or zo6 mass air, throttle body harness, and knock sensor extension,
http://www.speartech.com/category_s/1826.htm

You will need to use an LS2 silver blade throttle body.
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Old Mar 10, 2013 | 02:36 PM
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Originally Posted by 59VetteFI
Your LS1 PCM will work, but will obviously have to be reprogrammed for the new engine. You will need this for converting the 58x signal to the 24x signal: http://www.lingenfelter.com/mm5/merc...3#.UTVbvRzrzRE

Here is the page to some adaptor harnesses. youll need map sensor harness, injectors, cam extension, mass air if you change to a card type or zo6 mass air, throttle body harness, and knock sensor extension,
http://www.speartech.com/category_s/1826.htm

You will need to use an LS2 silver blade throttle body.
Thank everyone for their responses.

As I view a picture of this engine it looks to be complete therefore I don't understand the need for injectors, cam extension,throttle body, knock sensor entension ( thought the knock sensors were under the manifold).

Did you get a chance to look at in on the Jegs.com website?

Thank you.

Please excuse my ignorance

Last edited by bontrager; Mar 10, 2013 at 02:37 PM. Reason: spelling
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Old Mar 10, 2013 | 02:47 PM
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The connectors don't match up with the ones in your harness. Some are different, some are too short.

Yes, I've seen the Jegs website. I'm thinking about doing the same swap myself. I get a pretty good discount from Jegs advertised prices since I've been doing business with them so long.
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Old Mar 10, 2013 | 04:40 PM
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You MAY need to replace the TB with one from an LS2. People have been having trouble tuning the LS3 TB on the the C5.
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Old Mar 11, 2013 | 08:44 AM
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Once again, thanx to all. Starting to get expensive aad don't even have a quote on the labor install or a quailified shop to do the install and tuning.

See to be pushing $10,000 with all the extra parts needed.

May have to pass. I was just looking for more low end torgue. Would changing the gear ratio to 390 give me what I want (6 speed manual)?

Thank you.
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Old Mar 11, 2013 | 10:13 AM
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$10k is probably a pretty good number for something like this.

I ran 3.90's in my 346 build and have always said "These cars should have come with 3.90's". It puts every gear in a more usable place and the seat of the pants kick is excellent.

I even got a wild hair and had Rick Kim put 3.90's in my 427.
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Old Mar 11, 2013 | 10:22 AM
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I was looking at coming in way under 10K for this. But I'm going to do all the work myself. To me that's part of the fun.
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