tsteel1

Can anybody help me, Im going to build my 99 ls1 block was wanting to know what tne largest displacement I could get out of this block without resleaving the block. thanks for your help in advance .

1nasty86

iTrader: (63)

396ci

tsteel1

Would you use the same crank as the 383 and then bore larger, if so what do you need to bore over

garygnu

a 396 ls1 with a 3.908 bore would be using a 4.125 stroker crank.you can none a ls1 out .010.

bww3588

iTrader: (49)

.005-.007 is about max..010 would be pushing your luck, esp with a 99 block.

PREDATOR-Z

Larger than 4.00 crank on LS1/LS6 is doable but not recommended for street. Because with increased stroke the piston comes out further down at BDC and has more sideways loads/rocking exposing the skirts in crank area and they have a tendency to burn oil after awhile.
Most of the successful builds I've seen of that kind are more track oriented (no real longevity). Of course this is somewhat relative to the $$ one spends and especially how good the builder is with the correct parts.
It is more reliable to use 6.0 blocks and build 402>408 cid. Keeping the motor square.

tsteel1

Ive built a dozen gen ones not use to this small bore thing guess it well be a all new expieriance guess ill try a 383 or something similar , what can expect compaired to gen one thanks for all the comments

PREDATOR-Z

A 383 LS is more powerful than 383 SBC.

LS1-450

iTrader: (33)

Can 't find the thread, but there's a guy in the dyno section who over bored a stock 3.898" LS1 to 4.00". I had asked him to keep us updated over the lifespan of the engine & have not received any update. Most feel as though it won't last given the thinner sleeves. Who really knows for sure until it's tested? Would luv to find out how it's doing.

If anyone can find it, please link the thread here. I'd like to tag it for future reference.

1CAMWNDR

iTrader: (21)

Cubic inches are not nearly as important as airflow through the engine. Power is in the cam/cylinder head/intake/exhaust combination more than anything. I would stay at a4" stroke 382-383. Any more stroke than that and you are not doing much better because the small bore will not let the heads breath.

PREDATOR-Z

There is no substitute for displacement but it has to be done right. A 393/396 will produce more trq and therefore accelerate quicker but the issue is the piston's position and the stock sleeves.