lawrenq

iTrader: (2)

I'm currently in the process of swapping an Ls2 into a 71 Chevelle.

Here's what I have, an ls2 with unknown miles that is currently disassembled for inspection at the machine shop. LS3 intake and l92 heads that have been shaved .010 with btr spring kit installed. My original plan was to run the ls2 with the ls3 heads and a custom cam. But I know that in the end I'd regret not doing more.

So now I'm debating on purchasing a new ls3 block along with forged rods and pistons, while using the crank and everything else from the LS2, to better fit the heads and intake that I have. Another option that I'm seriously considering is buying the dart sleeved block from Texas speed with a 4.125 bore and running that with a stock stroke.

I don't have a power goal in mind but I'd like the chevelle to be able to beat most modern muscle cars.

tech@WS6store

iTrader: (2)

Youll spend much less money with keeping and rebuilding what you have. I would take the ls2 out to 4.030.
Our complete rebuild kits are $699. Gets you everything but cam springs pr and lifters.
We can get you anything you need for peace of mind, but going in thousands of more dollars in the hole doesnt seem like as good idea as working with what you have!
Just our input though

Darth_V8r

iTrader: (4)

Doing a 4.125 bore x 3.622 stroke is a 388. Very powerful motor. It likes RPM. Big Hammer built one in his TA, made 630 rwhp NA, ran 10.4@136 on a track that the surface was so bad, they had to close the track and repave.

So, given the list of options you posted, there's my answer.

lazerlemonta

That 388 is a piece of work. I knew a guy who made 539 with a 346 as well so that ls2 bore is plenty capable of being a nice piece. Got to have a goal in mind to know where you want to finish. If you want an average build ws6 tech can help you out for cost effective everyday power goals for sure.

tech@WS6store

iTrader: (2)

We can help you get very serious also. Having a firm goal in mind is really the first step. Budget is 2nd. Then stay on track. We have some pretty good builds from last year that make impressive track times as well that arent money pits as well.

lawrenq

iTrader: (2)

I'm aiming for 450 to 500 to at the wheels, but I'd like the option to go bigger down the road. I'm thinking about the 388 route more as it's not that much more expensive than building an ls3. I'd rather not bore the ls2 block .030 because that would limit it's use in the future. But I'm curious as to what comes in the 699 rebuild kit, I'm having a hard time finding it on your site.

lazerlemonta

big hammer

Easy peasy

Take that ls2 block out to 4.030 or more. Use the ls3 heads. Put a good rod and piston in it. Get a mid length runner fast intake. 11.5:1 compressions or so. Call Cam motion and get a custom Cam ground to shift around 7500+. It will rip ****

big hammer

:blush:

lawrenq

iTrader: (2)

That's pretty impressive for a bolt on car, my car is a full bolt on car too, I mocked up the ls2 in the chasss with a cai, 1 7/8 longtube headers and full 3 inch exhaust with an x pipe.

lawrenq

iTrader: (2)

It seems like a decent alternative would be running the ls2 .030 over. Does anybody have any recommendations for a piston that clears the ls3 valves that would give me decent compression. It looks like mahle and diamond both make 2cc dome piston that would get me 10.6 on a stock ls3 head.

fastlt1

iTrader: (4)

How would a stock ls3 compare to a stroked ls2 with ls3 top end. Same ls3 cam.

Darth_V8r

iTrader: (4)

Given the same stock heads and cam, the striker would make more torque and hit peak power earlier. The stock stroke will rev higher and hit peak power later. They would make quite similar peak HP numbers, but tq would heavily favor the stroker.

Che70velle

iTrader: (6)

I have an ls2 with ls3 top end that just came out of my Chevelle. I went with Mahle pistons in that engine, and it had about 10.6, as you stated.
It was an honest 500 horse setup that ran out strong.

pantera_efi

iTrader: (1)

Hi Lawre, Brody ran my ECU-882C in his Black 65 Chevelle when it had the BBC N/A engine.
You will need an Engine Control Unit, with software for calibration, a great price is given to LS-1 Tech members. (my ECU I hope)

MY Method could be MORE cost effective :
HONE your LS-2 to 4.007" AND fit my 4.1" Forged Crankshaft, Forged "H" beam rods, Forged Pistons, Steel Rings AND balanced for $1850.00, a LS 413.

The second choice if you want a LS-482 is the use a RHS Tall Deck Block and a 4.5" crankshaft.
The cost of a "sleeve block" vs RHS block is greater though many other items are included saving some money.

What is your projected cost to meet your needs ?

Lance

lawrenq

iTrader: (2)

Thanks, I've read your build threads, my car is also a 71 that I converted to a 70. I took a lot of ideas from your original build. I see that you wanted more after the ls2 with the ls3 top end. Did you ever take the car to the track before you upgraded the engine?

tech@WS6store

iTrader: (2)

Taking the ls2 to 4.030 adds cr and hp potential as well.

pantera_efi

iTrader: (1)

Hi Lawre, I have inspected/observed LS-2 Crankcase "core shift" with sleeves NOT centered at the deck position.
GM STATES not to bore LS cases in MANY manuals.

TAKE to time to Sonic Test before increasing the bore size.

Lance

lawrenq

iTrader: (2)

I've been reading about this, I'm thinking about getting the block sonic tested. But I think that I'll be better off in the long run with the sleeved block, plus that'll leave room for plenty upgrades in the future?

tech@WS6store

iTrader: (2)

Im not sure what he has seen, but i can tell you ive seen more than a fair share of 4.030 ls2 blocks. some boosted even. no issues.