G0at

Hey LS1 Forum,

I am at the point to buy a GTO and I am looking into two of them.
2004 LS1 408
and 2006 LS2 403 or 402 am not really sure

LS2 made 485rwhp
LS1 hasnt been tuned yet but owner said it should put more than 500rwhp

I really confused as I heard LS1 block is heavier or something
Both are N/A and im planning to put f1 pro when i buy one.

Someone help me please

HCI2000SS

iTrader: (2)

The 408 is a LQ9 or LQ4

G0at

Im not really into chevies so I have no clue whats the different betweem both of them but i made a fast research and got two different answers. If it is about the block material the 408 is iron block. If it is about the pistons shape i have no idea .

KCS

iTrader: (20)

A 408 is normally a 4.030" bore and a 4" stroke. You can take an LS2 block out to 4.030", but usually a 408 is built using a 6.0L iron block. That would be the heavier block as the LS1/2 blocks are aluminum.

With an LS2 block, 4.005" bore is more common with the stock sleeves, which ends up being a 403 with the 4" stroke.

An LS1 can only go to about 3.905" on the stock sleeves, which would be a 383 with the 4" stroke.

G0at

Hey,
Thanks for reply. Both cars already built. I just need help with chosing between them. Am not building

KCS

iTrader: (20)

I understand that. You were confused about what engines were in them, were you not?

stevieturbo

Both could simply be incorrectly or falsely advertised as to the engine.

As everyone says...you ain't getting a 408 with an LS1 block unless it's been very heavily worked with new liners etc which would almost be pointless unless it was done over a decade ago before other options appeared.

Robert Brown

why are you here then ???

G Atsma

He's not. He hasn't been here for 5 years, which is also how old this thread is.
Man I wish people would check post dates.
I notice most of this type are posting for the first (and often only) time.