JLSain

iTrader: (3)

Had some divits where bad piston rings wore at the top of the cylinder where the piston ring ends so I need to bore it over.

Some people have said that boring it anymore than 10 over is too much. Some say it's not....

For the guru's: What's the most you would want to bore a stock block over without putting in sleeves? All I need it 20 over to clear the divits and go with some forged pistons/rods.

Will that make the cylinder walls too thin??

Someone please explain why or why not. Thanks guys!!

3.4camaro

iTrader: (1)

all ive heard is that you can go 10 over and then you need new sleeves.

EDIT- but im not a guru

DONAIMIAN

iTrader: (18)

When cleaning up the block most go from the stock 3.898 to 3.905 or 3.910. Anything more and you need to pick up a new block.

1BADAIR

iTrader: (1)

what year?
98's can't really be done at all from what I hear.
Mahle and a few others have 3.908 pistons but most are 3.905

JLSain

iTrader: (3)

2002 LS1 block, it's not an LS6 block.

3.4camaro

iTrader: (1)

just resleeve it and bore it to 427

JLSain

iTrader: (3)

If a moderator is to move my thread, could he/she please leave a redirect or let me know? Thanks.

pist0lpete

iTrader: (3)

3.910 is the max for the 2000 up blocks. Anymore and you are going beyond what is recomended although people have done it to success. Even so a .020 piston may be hard to find or impossible. If it is a 98 to mid 99ish block you can only bore to 3.908 I believe might be less than that never researched it since my block is 02.

JLSain

iTrader: (3)

I'm totally new at boring so what does 3.910 bring it to? .010?

PREDATOR-Z

Average bore safe use 97/98 and some 99 .007 hone
Some 99 + can go with .01 but still better leave some meat and go with .007

So in general for street better be safe and not go beyond 3.905 bore

JLSain

iTrader: (3)

Anyone else had advice? Thanks for the input so far from everyone!

ArcticZ28

iTrader: (14)

I was talking to somoene recently who bored theirs to .030 over and was pushing out 700hp with no problems in their track only car. So, it can be done and it has been done. As for safety and reliability, that's up to you decide. The less you hone/bore, the safer (obviously). You just have to find your comfort zone in the balance.

JLSain

iTrader: (3)

ttt!!!

JLSain

iTrader: (3)

How many people think that it would be okay to go .020 over??? Like I've said before, I've been told that anything more than .010 over is asking for trouble b/c of thinning the cylinder walls.

Also, someone else told me that the cylinder walls in an LS1 block were sleeved in, not cast in? You can't cast cylinder walls in an aluminum block, can you??

BryanJohnson

iTrader: (12)

the "cylinder walls" are sleeves and it is a machining process to re-sleeve an LS engine. why not just buy a used bare LS1 block for a couple hundred bucks and be done with it.

kossuth

iTrader: (12)

Your question didn't make the most sense but I think I know what you are asking. Yes, you can cast iron sleeves into an aluminum block. The way it is done is that basically they place the sleeves into a jig in the cast which resembles the way the cylinders will sit in the finished block. They then pour the hot aluminum into the casting where the sleeves already are. The outside of the stock sleeves are like a corrigated drainage pipe so the metal will lock on those rings and hold the sleeves in. Aluminum expands about 50% more than steel or iron so they need to be locked in somehow. After that they deck the block and finish bore the sleeves and it's pretty much done. Now, as for how much to bore the block "sigh" you can go .010 over MAX on a 99+ block, and about .005 on a 97-98 motor. You go over this and you risk cracking the sleeves. Now you can resleeve an aluminum LS1 block, but it you need to have a crack machine shop do it because of the fitment issues of an aluminum block + iron sleeves and the expansion rates and such. It almost boils down to the controlling the temp of the block while being machined it's that critical.

pist0lpete

iTrader: (3)

Another thing to consider is if you decided to risk it and go 20 over where in the world are you gonna find 20 over pistons and a set of rings?

JLSain

iTrader: (3)

Good info. Keep it coming! I'm leaning more towards buying a bare block at this point....

ty_ty13

iTrader: (42)

custom sets.... but custom=$$$$$ so you better buy 8 spare to knock down some of the cost per cylinder

chriswtx

iTrader: (5)

Just buy a new LS6 block for $550 from TSP and save yourself the trouble...