driver56

I noticed the blocks I've seen personally have the same foundry mark as iron blocks and heads from World Products. No real evidence of core shift either.

bww3588

iTrader: (49)

You can't be 100% sure unless you sonic test it or bore thru the wall. Core shift is not something you can see with the naked eye.

1999FirehawkLS1

iTrader: (21)

Ya but depends on the Heads, Cam, and A TH400 stalled will kill it w that S60 also...

thobart

iTrader: (3)

no evidence of true core shift. There has been a lot of finger pointing to photos of an LSX block honed out to different bore sizes per cylinder that has been represented as core shift. While you may not be able to prove exactly that a block has been core shifted without a sonic test does it matter if the block is strong and machines out correctly. Core shift is a casting problem where a block has not had the metal pored correctly during the casting process. It is either going to be weaker or not true for the bores in the block. All I am saying is the one I have has been as true as any other block I have dealt with. So all you can say is that the block may be less strong in some way. I have seen no evidence (and I have looked all over for it) that I can verify that anyone has had a real big problem with these blocks. I have heard but again not able to verify that some of them had material problems that exhibited in the machining process. I would think that some of the vendors on the board would be able to say something to this if it was a real problem.

1999FirehawkLS1

iTrader: (21)

I dont think it was a real big prb cuz before I bought Mine used I called GMPP and ran the Casting numbers threw there Engineering Dept and they acted like there was a few before they hit the market they knew about but none after the RnD stages...but Of course there prb goin to tell us what we wanna here also

KAOS

iTrader: (5)

Its down in power because of the ls6 heads and intake. I'd say it would be quite a performer with the right heads and intake

Jontall

Core shift is scary because of the investment made. That core-shifted boosted GMPP 454 LSX crate motor over at Camaro5.com cracked like an egg and GM said the warranty was voided because of boost. The only way I'd use the LSX block is to have it sonic tested before I buy it.

KAOS

iTrader: (5)

that is my concern. i dont want to be out all of this money on a car then all of a sudden have to replace the motor

87silverbullet

iTrader: (11)

You really listen to anybody on camaro5? If thats the same thread I'm thinking about tell the whole truth about it. There is more to it than just "boost" and "cracked like an egg"

1999FirehawkLS1

iTrader: (21)

Ah can we say 454 = Thin Walls = Why no one ever build a turbo motor lsx 454...... lol