pcf_mark

iTrader: (1)

I know this has been debated in the past but I am looking for some solid numbers. What is the limit of a stock LS7 block? Hot Rod this month indicated 600 HP was max because the cylinder walls are too thin. I was considering putting low compression pistons in an otherwise stock LS7 and putting 10-15 lbs of boost in it. That is more than 600 Hp and I hate to crack the block (again - another story). Anyone actually experience a failure?

trumperZ06

The GM High Performance Parts catolog shows GM's recomended max hp. rating for GM's current blocks, as I recall. I'm not at home to look up the LS7 block but if memory serves... it was ~750/800 hp.

pcf_mark

iTrader: (1)

GMPP catalog states "tested to over 500 HP". Not real clear on what that actually means! The heavy duty blocks have maximum power ratings.

Shock Hawk

How does this compare to the LS1, LS6, and LS2 for the maximum hp? (keeping options open)

slow95z

iTrader: (33)

the LS1 block with wet sleeves can take a ton for sure.

2001WS6Vert

So far I've put 14 lbs. on her. I'm working through a high RPM issue but I expect around 700 rwhp once it's worked out.

Shock Hawk

Sry, what do you mean by wet sleeves? Are there dry sleeves? (I know about the sleeves in the cylinders, just not the terms pertaining to moisture)

Beast96Z

iTrader: (21)

The block has to be re-sleeved to get either or. Yes there are wet and dry sleeves. Wet sleeve means that the sleeve actually comes in contact with the coolant wearas a dry sleeve uses the blocks remaining aluminum as a barrier from the coolant. All stock blocks are "dry type" sleeves.

chuntington101

LS7 blocks have taken massive abuse and come out shinning! i have seen 800rwbhp N2O setups and a 1000+bhp twin turbo.

if the liners do crack then have a word with R.E.D (race engine development) on here. they can now do new ducile iron sleeves for the LS7.

thanks Chris.