Floorman279

iTrader: (11)

Wat kind of gains would i see if i bored my 1998 ls1 from the 3.896 bore to a 4.000 inch? Its possible even tho the walls r thin rite

96 Comp T/A

iTrader: (8)

Not possible, without sleeving. 3.905 is as big as you can go.

Floorman279

iTrader: (11)

Ok i figured i was reallystretchin it.

ivan_key

get an ls2 block

bww3588

iTrader: (49)

on 97-98 blocks, 3.903 is max.

99+ 3.908 is max but pushing your luck. 3.905 is usually said to be max.

180ls1

iTrader: (4)

im with the posters above

gta3uzi

At 4.0 I think you would be running on virgin aluminum cylinder walls.

BOBS99SS

iTrader: (2)

Ls2 block is my vote,

Randy WS6

iTrader: (69)

Like said above, Get a LS2 block they are 4.00" bore from the factory, I have a LS2 in my car right now and its bored .030" over (4.030") But a LS1 can not be bored that big, the sleeve are just to thin, .005" is about max. And you can not bore any LS block .104" over like your wanting to do with factory sleeves.