Want to engine swap. LS7 or LSX better option?

[Epitaph]

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.

[JewelZ]

get a jet! not a Camaro

[The_Blur]

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.

[dankss]

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

[Z_Rocks]

Originally Posted by ls7camaro

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/

[FelipeShaw]

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!

[VADER SS L99]

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.

[mikepage0007]

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..

[Unreal]

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.

[2SS45th]

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.

[Unreal]

Originally Posted by 2SS45th

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.

[VADER SS L99]

Originally Posted by 2SS45th

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.

This is interesting as I did not know that. What is the cost of the B15. Not that I would go iron as I plan to stay below 650rwhp but just curious.

[Bad Dad]

ERL http://www.erlperformance.com/produc...locks-domestic SUPER DECK if you want to keep the weight off DI Sleeved 6 bolt

[JLE58]

Originally Posted by VADER SS L99

This is interesting as I did not know that. What is the cost of the B15. Not that I would go iron as I plan to stay below 650rwhp but just curious.

The only diffence is the pistons they still used the stock powder metro rods etc..