My6speedZ

iTrader: (18)

If you building a motor with low compression for a supercharger or turbocharger, what is the minimum you would want to go on sleeve thickness on an aluminum block?

Does anyone know a reference chart that has the numbers for the different blocks.

I am wondering just how weak the LS7 sleeves are as I was talking about it in another thread.

I know re-sleeves often boast more thickness at larger bores than stock with smaller bores. Just trying to get an idea of where they draw the line between just a re-hone or needing to be sleeved.

9sectruck

iTrader: (9)

on a factory sleeve no more the .0010 over the stock size for a power adder.

My6speedZ

iTrader: (18)

What is it that makes the LS7 liners weaker? are they thinner overall dues to the bore requirements? If they are using the same sleeves for all the gen4 blocks?

So.jerZ-28

iTrader: (20)

I disagree... Certain blocks will hold more power without egg'n or twisting the block, such as a iron 5.3 or 6.0 block.

EVERY BLOCK should be sonic tested before boring and consult with the engine builder on how much can safely be bored to withstand your hp goals!!!

9sectruck

iTrader: (9)

as op stated this is for a aluminum block not cast iron.
thats why I said .0010 on a stock sleeve, most cast iron block that I have seen dont have sleeves in less they really got f---- up

9sectruck

iTrader: (9)

on your question I do think the sleeves are to thin from the start for big power, but never really had a chance to mic a ls7 sleeve.

blue00ZZleeper

iTrader: (5)

From what I've heard the LS7's use a different style "Grey" iron liner. I believe that their more brittle then other liners, but were a good bang for the buck for a stock LS7. Most people looking for big power endup resleeving them. I'm sitting in the same boat right now, doing homework for a new motor. I would look into a LS3 block. On their stock bore, they seem to be pretty decent and with a slight increase in stroke, you can get up to a 427ci. I'm leaning more towards a LSX block but I'm a little concerned about core shift.

SirNemesis

I'm running 30thou oversize on my LS2 block, no issues so far.

My6speedZ

iTrader: (18)

Ok, i was wondering if the same sleeves were used in all the blocks or if they were different.

For me personally if I ever go Procharged (thrown the idea around a few times) I would just go with a set-up almost identical to yours. 390ci iron with an F1

I was just curious where there is alot of talk about ls7 popping under little boost.

Yea I know you can go 30 over for n/a builds. With the extra heat, wouldn't you want to keep it at no more than 10 thousands over like the other guy said?

Whats the biggest enemy for the cylinder walls in a nitrous or f/i application? The additional heat created or something else?

SirNemesis

Mines turbo. 390ci AES rotating assembly with a Borg Warner S400SX3 (S475).

WS6HUMMER

iTrader: (19)

I'm interested to know if a aluminum 5.3 punched out to a 5.7 will hold any boosted power.

My6speedZ

iTrader: (18)

I know the 5.3'd are a prime candidate for a re-sleeve.

Sarg

iTrader: (6)

They look to have pretty thick sleeves (the al 5.3) from the factory. I will see if I can get my partner to mic one of the ones we have laying around.

WS6HUMMER

iTrader: (19)

What about when punched out to a 5.7? I think they have to be bored a lot, lik .9xx something.

blue00ZZleeper

iTrader: (5)

I'm pretty sure a couple of guys have taken them out to a 3.905" bore. Even more have left it in stock trim keeping the cyl walls stronger and just ran a lot more boost.

Sarg

iTrader: (6)

We plan to just leave it a 5.3 in favor of much stronger cylinder walls!

98BLOWNZ28

iTrader: (10)

I don't quite understand why people go with 370s. All I hear is they are a good balance in cubes and perfect for a power adder, but I think it's kinda stupid to bore it .030 over from say and ls2/lq block which are 364 stock. So why make a 370 with thinner cylinder walls, just to gain 6 cubes? Lol.

LS1NOVA

iTrader: (12)

Because most core blocks need an overbore and .030 pistons are readily available.

blue00ZZleeper

iTrader: (5)

When you bore it out, you facilitate less valve shrouding with heads that use larger valves. The intake valve ends up "Shrouding" the airflow on a smaller bore motor. Boring it out, allows more room for the air to enter without it "stacking" up. I use stage 3 LS6 heads with a 2.08 intake valve and I wanted the best possible airflow I could get.

My6speedZ

iTrader: (18)

Good to know.

I believe on the boost 5.3 AES sells they are running a 3.850 bore.