got-a-ls1

iTrader: (12)

So im banging my head off the wall trying to decide what i want to do for a built motor. On one hand i think the slightly less cubes on the 347 will like the turbine better where the 370 may start choking?? I want to make power to atleast 6500 with a built motor.

My main concern is cylinder liner strength. I have seen a few ls1's on here lately with cracked liners and its kinda sketchin me out. I know if i go 6.0 there will be no problem with strength but it may choke the turbo out at the high rpm and i have an extra 80 pounds i dont want on the front end.

My goals 95% of the time are to run around 650 rwhp. Then for dyno days and ***** and giggles turn it up to ~800 or so. Im sure the key to keep the liners alive is no detonation and i am planning to run meth.

My 5.3 is doing awesome i just realize that it isnt going to last forever lol... want to have a motor ready for when i want to change it out... just need to decide on iron or aluminum. actual experiences would be sweet

code4

iTrader: (30)

Just punch out that 5.3 to 3.898 or whatever. I have one that is at 3.903, never had a problem.

FasTimeSS

iTrader: (47)

either one will do fine id say a 347 would move the turbo more efficiently

Nitroused383

iTrader: (10)

I'd personally stick with the 5.3, they make some off the shelf pistons for it too.

got-a-ls1

iTrader: (12)

spool time is very important to me also because i am a 6 speed. i think before i make any decisions i need to try the .96 hot side on my 5.3 instead of the .81 currently on there to see how much spool difference there is. If it still spools quick i would consider getting a l33 and parting it out for a cheap 5.3 aluminum block with nice beefy liners. I am doing this to avoid a long down time of building an engine, so building the 5.3 in my car right now isnt an option.

but really am i worrying too much about the ls1 liners? are they really as weak as im afraid they are? lol..

LS2Ttype

iTrader: (9)

i built a forged LS6 , I used the cross breed LS1/LS2 Block,, it was the block they used in the 5.7L GTO's in 2004 , Strong block, from what i hear its basicaly a LS2 with 5.7 holes in it , my block uses LS2 covers front and rear.

callies crank and rods, diamond blower pistons , arp main and head studs , DM performance LSX engine girdle etc,

end result 740/670 RWHP and TQ at 15 psi , pump gas and meth injection