98RedBird

iTrader: (77)

Trying to decide which would be the better route to go. The blocks are very close in price and the internals would be nearly identicle as well. I can get more CI out of the LS3 which is nice. I would use a 4.1" stoke to get 427CI out of it as opposed to the 402CI out of the LS2 block. The motor will stay N/A. I do however want to stick with the aluminum block because I want to keep the weight down.

Are the conversions the same between the LS2 and the LS3? The motor will be going into a 2002 Camaro Z. I would just like to hit around 500 to 550 to the wheels with a healthy torque curve. It will just be a street cruiser that I take out on the weekends.

Like to hear your opinions guys!

Thanks

BAMF

I'll vote for a 427 LS3

FAST FREDDY

^^^^ so does the LS3 conversion require less parts to do than the LS2 conversion?

posz28

iTrader: (1)

LS3 all the way..more power

XtraCajunSS

iTrader: (2)

There is no real difference as far as conversions go.

Shane

98RedBird

iTrader: (77)

So then there's really no reason not to go with the 427 LS3 then? Does the T-56 mount up the same way or will modifications need to be made?

Gordon0652

iTrader: (4)

Same Way. Goodluck!

marksboy7

iTrader: (6)

+1 for the ls3 427. Mine should be shipping out from Texas Speed in a couple days.

98RedBird

iTrader: (77)

What was the price on that if you don't mind me asking?

UVETTYA

iTrader: (-1)

Ls3 427. Mine just arrived yesterday.

marksboy7

iTrader: (6)

Right at $5700, thats with all the options I wanted

slt200mph

iTrader: (42)

LS3 all the way

ajw2500hd

iTrader: (12)

i just installed a ls3 new crate with lg motorsports g6x3 cam and i love it!!!!

ERL Performance

We have a fully sleeved, machined, honed, balanced and blueprinted 427package that starts at 5500.00 and you could bore it on out to 4.165 if you wanted to go even bigger. I can do high compression or low compression pistons. You can get on our website and look at our different packages and if you have any questions about them just ask me. This package is a sleeved block and will hold much more power than stock sleeves will.

racecar

LS3 (4.07) block, with a 4.00 crank = 418. That's a good combination.
Your 427 with a 4.1 has a stroke bigger than the bore. That may not be the best way to go. There are probably a lot of people here that could prove me wrong, but that is a big crank to be swinging. I would rather keep the weight of the internals down with a smaller stroke. That will rev fast.

UVETTYA

iTrader: (-1)

This is just a question but wouldn't the extra stroke provide more torque?

AjSmoker

got to love those ls3!!!

racecar

Yes, In theory more torque, but at what cost, there is usually trade off. The long stroke may have better low end, but less power on the top rpm because you have more weight of the rotating mass. Those pistons are small compared to that crank. LS7 is 4.125 x 4.00 That's a pretty good combination for power and torque. It's just theory, but long stroke small bore engines are for fuel mileage, short stroke big bore are quick rev racing engines. IMO, when the stroke is bigger than the bore, something is going to slow down somewhere.

99blancoSS

iTrader: (115)

Bigger the better

racer7088

Like 99BlancoSS said with the 4.100 LS3 that we do the rotating assembly is lighter (than a 6.125 rod 418 and we do both a lot) since we use a longer rod and a much lighter piston but .050 more arm isn;t going to really change much anyway. 418 works well too though.