....just wow. I am really considering not using this block for my next build. 
LSX Block Questions!
LSX Block Questions! Im looking at a LSX short Block to buy hopefully,
They call this the, LSX Gen 1 Block....
Has anyone herd anything bad about these?
And why did they change the block after this one????
They call this the, LSX Gen 1 Block....
Has anyone herd anything bad about these?
And why did they change the block after this one????
Well, I don't know if I would say never use one, but I would advise that any potential buyer have a block sonic checked to verify what was shown above is not the case for the particular block they are looking at.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Teching In
Joined: Apr 2010
Posts: 14
Likes: 0
hey guys i think you will find this cutaway has been prebore to different sizes.....
could robin @ chevrolet parts chime in to confirm or deny?
im using a second design lsx block and it checked out all good...
i could be stood to be corrected on first line though.
cheers dave
could robin @ chevrolet parts chime in to confirm or deny?
im using a second design lsx block and it checked out all good...
i could be stood to be corrected on first line though.
cheers dave
If you look at the picture, it appears you are correct. Look at the difference in thickness between the bores from left to right, right where the bores are closest to each other. These should all be the same thickness, when the block is bored to the same diameter in each hole. This particular one is obviously not, and no amount of core shift will change that dimension.
TECH Resident
Joined: Apr 2008
Posts: 828
Likes: 12
From: Right here, right now!
The possibility of core shift is a fact of life with any casting of this size and type and has been for decades. Molten iron is obviously not an easy thing to handle and is poured in without much finess and tends to push the cores around. Any block should always be sonic tested for wall thickness to ensure blocks with minimal or no core shift are used with big power. Same for alloy blocks though with cast in liners it is very obvious how far off centre they are.
This block isnt bad. There is still plenty of thickness along the major thrust faces. The left most cylinder which is max bored just accentuates the view of the thickness. The core at worst is 0.015 - 0.020 off. Thats nothing.
The early blocks that had trouble would break through with a regular 4.125" hole bored. That IS core shift.
This block isnt bad. There is still plenty of thickness along the major thrust faces. The left most cylinder which is max bored just accentuates the view of the thickness. The core at worst is 0.015 - 0.020 off. Thats nothing.
The early blocks that had trouble would break through with a regular 4.125" hole bored. That IS core shift.
