grinder11

iTrader: (1)

Anyone know-FOR SURE-if there is any difference in strength between the L92 block and the LS3 block? I think I read somewhere that when the ZR1 C6 came out, the LS9 engine was built around an LS3 block because, with the exception of the C5R block, it is the strongest aluminum block G.M. makes, including the LS7 block. The strength comparison to the LS7 appears to make sense, because it would seem that G.M. could get the same 600H.P.+ output from the LS7 with its 427 cubes with far less boost. Thanks.

chuntington101

best to speak to someone like VA speed. These guiys have pushed over 1500bhp out of GM cast LS2 blocks.....

Chris.

billy.johnson

iTrader: (5)

What type of hp are you looking to make

WS6-R

iTrader: (1)

LS-Series Blocks Ratings by GM

LS1/LS6 Alum 3.890" " RATED @ 450 HP
LS2 Alum 4.000" RATED @ 450 HP
L92/LS3 Alum 4.065" RATED @ 525 HP
LS7 Alum 4.125" RATED @ 550 HP
LS9 Alum 4.065" RATED @ 635 HP
C5R Alum 4.117" RATED @ 900 HP

got-a-ls1

iTrader: (12)

if those ratings were true there would be a lot of blown up cars around here. Funny how conservative gm is with those ratings...

396D1SS

iTrader: (21)

lol i agree

SOMbitch

iTrader: (8)

As I understand it GM didn't SC the LS7 because the liners are too thin to reliably hold boost. I have heard of a few cases of cracked LS7 liners but never seen one.

WS6-R

iTrader: (1)

Well, actually they say TESTED AT OVER...

jimmyblue

iTrader: (11)

I think you will have different real-world fail points
depending on whether you make your HP by torque
/ cylinder pressure (boost, stroke, CR) or by RPM.
Lifting heads vs breaking rods, etc.