91ls1silverado

I've always wanted a 454 LSX block but i also want to go big with boost like a single big turbo or a procharger. But will it be good for boost if i build it for boost? Or will it just blow? Its going to be street driven on 12-14psi and at times go 21-24psi...

BMF_Racing

iTrader: (6)

Depends, what is you whp goal?

Cylinder wall thinkness is more important than the extra cubes, so you will get lots of people going smaller bore in favor of thinker walls.

91ls1silverado

Whp goal is around 1500whp, and yup I hear that alot but then I see 454 LSX blocks pushing alot of hp on boost. And on other forums i see LSX cylinder walls cracked because of boost..that's where I'm confused..

cjmatt

iTrader: (4)

IMO, run the 376 LSX or Build your own. you dont need a 454 to make power with boost. Keep the displacement down and up the boost instead. GT5594 with a nice sub 400" motor will make 1500

91ls1silverado

Idk, Ive always wanted to go with the 454 but hearing they are weak..

willizm

iTrader: (10)

Doesn't GM make the LSX 376 specifically for FI applications? Me personally I like the idea of a 345-376ci turbo motor. Next one I do will probably be a 370ci.

DEFYANT

You can do a 454, but I wouldn't do a crate engine. Get a TALL DECK block and build it with a longer stroke instead of more bore.

91ls1silverado

Yea i don't want to do a crate engine neither. And wants the difference between a tall deck and short deck?

LS6427

iTrader: (2)

Do an LSX 402ci TT......it'll last longer than a 454ci and make 1,600 HP......if you must have a 454ci...get a tall deck block.

http://www.nelsonracingengines.com/p..._402lsx_tt.pdf

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LS6427

iTrader: (2)

2500 HP TT LSX tall deck 454ci........and reliable.

http://www.nelsonracingengines.com/p..._454lsx_tt.pdf

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LS6427

iTrader: (2)

If you have the extra cash.....have the iron LSX sleeved, then you can slam it with 30psi........LOL.......the ultimate in strength and reliability.

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rkreigh

thinking of just buying the block and building it as I haven't seen too many deals. I like the 376 B15 long block for under 8K, but I'm a bit scared of the LSA powdered rods

I'm looking to go 1000 HP, but don't want to step up to the big bucks for an RHS.

might just spring for a superdeck, a bit more expensive, but at least it's lighter

my turbos are limited to 1200 hp or so, and I think that will be all the car can handle chassis wise anyway (c5 Z06 with a RPM 4L65e auto)

DEFYANT

A factory LS block is 9.240" deck height, a tall deck is 9.750" deck height. The taller deck allows for a longer stroke and a better piston/rod ratio.

DEFYANT

Not true, Phil99Vette had a fully filled and dry deck LSx block and still broke it. Also, don't use psi as a referenced, 30 psi is different with each engine.

transam69230

iTrader: (49)

Why not entertain the option of getting a Dart LS Next gen block? 6bolt heads, redesigned to make for the shortcomings of the LSX. Priced about the same as LSX, comes in a 4.00 bore or 4.125 bore standard (no extra machine work for 402 or 427 CI), and also weighs about the same as well. The only thing different is the oil pan.

HexenLord

1000 HP is well within the limits of even a factory aluminum block. Spend the money elsewhere.

ERL Performance

Our Superdeck 1 blocks have several different features that really go a long way when deciding on which direction to go with.
- ERL Superdeck 1 sleeves are made out of ductile iron, which is 3x stronger than cast iron. (Great for Boost and going with larger bores)
- ERL Superdeck 1 sleeves are longer than most coming in at a 5.800 sleeve length. Keeps more of the piston up inside the cylinders when using a stroker crank.
- ERL Superdeck 1 can remain a 4 bolt block or it can be modified to a 6 bolt version.
- ERL Superdeck 1 sleeved block comes in 130 lbs lighter than the LSX block.
- ERL Superdeck 1 sleeved block comes with doweled billet main caps and ARP main studs. It also comes finished with all the machining and honing done. Least amount of hands touching the block, then better!

87silverbullet

iTrader: (11)

^^^^All valid points. My next setup will be with an ERL block

91ls1silverado

I am actually looking at your page and I'm starting to like the ERL blocks more than the LSX....Hmmm I'm starting to look for a 444ci with an ls7 top end to build...

mike13

iTrader: (27)

how does the superdeck 6 bolt blocks compare price wise to the other options out there? I know I can go on the website and get a price but looking for comparing the other options in a ready to install machine work finished comparison.