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Old 05-17-2009, 09:20 PM   #1
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Want to engine swap. LS7 or LSX better option?

i am looking to get about 850rwhp out of my 2010 camaro. I want to install either a kenne bell or a techco supercharger to the engine, but i am not sure what engine i should go with. The ls7 is more power, but thinner walls, and the lsx can handle a ton of hp, but is heavy. I would like to set the s/c to about 12-15 psi, so thats why i think the ls7 is out of the picture. Whatever i go with, i am going to rebuild the internals, new cam, etc. Just wondering if you guys could help, and tell me what the added weight of the lsx would really do to the car, thanks
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Old 05-17-2009, 09:24 PM   #2
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I'd look into a built LSX engine with a Vortech system set to fill your needs. You seems to want major hp from a S/C combo, so that why I say Vortech or ProCharger. MANY racing applications capable of running big boost. Personally, if money isn't really a question, I'd go with a custom turbo unit.
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Old 05-17-2009, 09:26 PM   #3
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lsx. the added weight is not that much to worry about. esp when you are pushing those kind of numbers. build you a forged 454 lsx and toss on a TVS2300 blower and call it a day
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Old 05-17-2009, 09:29 PM   #4
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yea turbos and this car i feel just dont go too well together, yea i want something that is really dependable, thats why im probably going to get the lsx
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Old 05-17-2009, 10:05 PM   #5
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I would look into a C5R 427 block will fully forged internals i.e. Callies

You will NOT find a stronger block. Be prepared to spend a lot of mine.
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Old 05-17-2009, 10:31 PM   #6
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but would the twin screws that fit on the ls3 or ls7 fit on the c5r?
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Old 05-17-2009, 10:58 PM   #7
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From what I read before [not claiming any experience], the C5R 427 is a great N/A engine for road racing, but the LSX or World engine has more tolerance and stronger walls for boost. I think LSX is more reliable in long run that LS7.

As far as turbo goes, the engine bay seems too small for all those tubes and stuff. Techo makes a nice addition to that LSX.

I've been thinking of the same thing except with less power, by swapping the LS3 engine with a LS9 from GM. What I like to know, what do I do with my brand new LS3 engine? Do I sell it? How much will I get for it?

[update] This article is a good article on LSX and it's comparison to C5-R:
http://www.vetteweb.com/tech/vemp_08...ine/index.html

Last edited by Z_Rocks; 05-17-2009 at 11:25 PM.
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Old 05-20-2009, 09:25 AM   #8
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Question 1: Why do you want a car with this much HP?

Question 2: Have you driven a car with more than 300HP? 400HP? 600HP? 800HP?

Question 3: Is this car going to be driven on the street?

Question 4: Is this car going to be raced on the street?

Question 5: Have you ever raced a car at the track?
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Old 05-20-2009, 09:53 AM   #9
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Looks like a direct duplicate from here:

http://www.camaro5.com/forums/showth...?t=2933&page=5

For the record, the LSX block adds approximately 100 pounds.

Last time we were in CA at an engine shop, the owner had me lift an aluminum block and then the LSX. Yeah, it's definitely heavier.

As a rough guideline, every 100 lb change is worth 1/10 second difference in a quarter mile ET (note that this is a ROUGH guideline and is influenced by just about everything)

It's nice to window shop, but as per Epitath above, you need to figure out what you want it for.

Enjoy. Hey it's cool that you want to modify it...
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Old 05-20-2009, 10:12 AM   #10
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Quote:
Originally Posted by Epitath View Post
Question 1: Why do you want a car with this much HP?

Question 2: Have you driven a car with more than 300HP? 400HP? 600HP? 800HP?

Question 3: Is this car going to be driven on the street?

Question 4: Is this car going to be raced on the street?

Question 5: Have you ever raced a car at the track?
These are all good questions. I'd also ask what your budget is.
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Old 05-20-2009, 01:41 PM   #11
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And that's just the start.

You're going to need to upgrade QUITE a few other things, will the drive shaft take that much HP and Tq? What about the rear end? How about rear tires, they aren't going to stick. Transmission?

This isn't a "swap the engine" deal, this is a:
Swap engine, transmission, drive shaft, rear end, brakes, rims, tires, etc...And it's not a "swap". If you want to go 200MPH, you're better off buying a white camaro and going from there. Save yourself a lot of time! Hell, you're probably better off buying the Zr1, if you're going to race on the street, you don't need to worry about payments, you need to worry about your life and every1 else along with it.
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Old 06-04-2009, 06:42 PM   #12
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i have decided to not have as much power maybe 700rwhp max, but was wondering what is really streetable, could the ls3 with built internals handle 10 or 12 psi for a long term engine life, or should i just go with a 376 or 427 lsx
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Old 06-04-2009, 07:29 PM   #13
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When you start throwing that much boost at an engine, the world long-term should not be in the same category. Yes, they will last, and if built properly they will be able to be driven alot and driven hard....But you do not build that much power and expect it to last 100k miles without issues. Even 700RWHP is over 800HP on the flywheel.

If it was strictly a drag car you could build it too get traction, btu then you would be blowing drivetrain parts all the time. As a street car you are not going to get enough traction to enjoy all the HP.

That being said, I build my cars for approx 600RWHP, and when done they are great street drivers, and they can still run into the 10s on the drag strip. That is all I need.

That is just my two cents.
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Old 06-04-2009, 08:01 PM   #14
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so my best bet for like 650rwhp would be the lsx 376?
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Old 06-04-2009, 08:41 PM   #15
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The LS3 Block can handle more boost than an LS7. With that in mind:

Find out what you need to do to upgrade the engine, so it can handle more than 12 psi (long term). You're going to want someone to do those upgrades, so find a reputable machine shop in your area & go with them to do the work. While you're having the internals worked on, you can get some better flowing heads & intake.

You're going to want this baby to breathe, upgrade the exhaust (Long Tubes if you don't have emissions).

Go Forced Induction. S/c or Twin Turbo's, whichever 1 you want at about 12 psi should get you somewhere around there or more, it really depends on what you do to the engine.

While the engine is being torn apart & worked on, you'll need a beefier transmission & rear end, go with a lighter drive-shaft. Going with a lighter drive-shaft (carbon fiber) can help achieve higher RPM's & faster (not sure how much). It can also handle more HP.

If you go with the lsx, you're going to have to buy another block. May as well not waste what you have. You already have a lot of the components you need, plus, you won't have to worry about This & That fitting.

I would just go with 1 of the pre-tuned Camaros. You don't have to wait for your Camaro to be worked on..Well, you do, but you can just order it & they'll let you know when it's finished. Plus, there's warranty's on these cars, not yours.
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Old 06-04-2009, 08:44 PM   #16
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Old 06-04-2009, 10:13 PM   #17
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Here's the thing. If you're not absolutely certain of what you are going to do, then you haven't done enough research. You need to decide, based upon the numbers and merits of each product, which products belong in your Camaro. Do yourself a favor. Do more research.
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Old 06-04-2009, 10:25 PM   #18
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you can make 650 - 700rwhp on your stock motor..... its been done on ls3's they usually dont make it off the dyno. haha

you need this

http://images.google.com/imgres?imgu...a%3DN%26um%3D1
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Old 06-04-2009, 11:00 PM   #19
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so my best bet for like 650rwhp would be the lsx 376?
LS3 has a great block, you can stay with stock cranck and change the rods and pistons and proper compression 9.5:1 and FI Cam and ported head, headers and TechCo S/C with 10-12 lbs, you can make 700 easily. But you need to start worrying about your rear end, clutch. Once you go over 600 RWHP, things and cost change very rapidly. If you're not racing and you want a kick ass car for the street that you can drive it everyday, don't go over 600.

Check out these new pictures from Techo SC for LS3:
http://www.dpmmedia.com/techco/photos/corvettesc/
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Old 02-10-2013, 01:42 AM   #20
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I'm interested in everyone's opinion also seeing I'm getting ready for my build also! I heard before 650whp is max for streetcar but I'm going over also! If you have a dream, go after it but yes be prepared to replace everything! And if you race a lot like I do be prepared for things to break! I can give you a long list of things that break on the car!
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Old 02-10-2013, 02:11 AM   #21
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Defenitly don't do LS7. Forge and or stroke the stock motor. If you want more CI than 416 and dont want the weight of a LSX have the stock block resleeved from someone like ERL.
Sidenote, I didnt know Techo was still in buisness. I used to have a 3V Mustang that I had planed to use their SC but they went out of buisness shortly after releasing the kit.
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Old 02-10-2013, 10:05 AM   #22
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i ran the ls3 with kb /cam and headers pushong 660rwhp for approx 6000 miles..ran it couple dozen times at track..motor never had any issues..drivetrain is another issue..i decided to do a bigger build and ran across a friend that built a 427 lsx with lsx7 heads and went that route..had to pull the heads as the lsx7 heads would not work with a camaro supercharger kit...went with mast blackl label heads..wanted the 6 bolt clamping power that the 6 bolt heads provide,have not had on dyno yet as car still under construction..
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Old 02-10-2013, 10:11 AM   #23
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Any gen 4 LS block can be sleeved and made into a 427 if you want to stay aluminum. ERL and RED both sleeve blocks for high HP. LS2/3, 5.3L or any of the aluminum blocks. Once you sleeve it and throw whatever heads on it, it doesn't matter what it started life as.

You can use an LS7 and do the same thing but no point spending extra just to have it reworked. LSX blocks are nice and have some advantages for big power like the billet mains, 6 bolt heads. You can also get those on aluminum blocks but pay extra. If cost is no concern do a RHS block.

For 650rwhp, stock ls3 will be fine. You can do a forged 416, or whatever you want really. It all depends on how much you want to spend.

I would avoid the LSX376 because of the stock rods and questionable pistons.
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Old 02-10-2013, 10:44 AM   #24
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The LSX376 comes in two variations, the B8 and the B15. The B15 is designed to handle 15psi, so that'd do what you want. I have an LSX416 and will be pushing close to 1000whp, not even worried about the motor.
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Old 02-10-2013, 01:23 PM   #25
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The LSX376 comes in two variations, the B8 and the B15. The B15 is designed to handle 15psi, so that'd do what you want. I have an LSX416 and will be pushing close to 1000whp, not even worried about the motor.
Even so you can get better motors for less money. You can get a TSP, AES, etc shortblock with better parts for less money.
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