WS6TransAm01

iTrader: (13)

If a Z06 block counts then YES it can be done!

Paul Z [black Z06] has a CARTEK built 346 with a stock block and stock crank that made 1016RWHP with Twin Turbo's

blackz93

iTrader: (2)

Doubtful!

Too many people running around with them.

PREDATOR-Z

Why would anyone risk all this $$$$$ on a stock block???
Some of the questions you guys ask

y2khawk

iTrader: (5)

Why not? I haven't seen/heard of anyone breaking them yet. Hell, I ran mine with a stock crank.

C5R is overrated IMO, an LS7 will only get you cubes. The WP block is still vapor-ware at this point.

So what's left, stock aluminum or stock iron.

For me, i'm worried about the weight, so my new motor is an LS2 block. I finally stuck a real crank in it though. And word is i should have the long block in a week or 2. Kurt's been bugging me to put it on the dyno at W2W. I will lean on it until I see atleast 1500 at the crank, or split it in half trying

xfactor_pitbulls

iTrader: (16)

****.........yeah that is leaning on it for sure. Its just funny how you have one side of people saying the alum. blocks wont handle 600whp for long and others that dont mind pushing to 1000whp. To me its kinda like the stock 10 bolt rear end. Most everyone dog cusses them, but I dont know too many people including myself that have really blown one up (even after beating the **** out of it).

Brandon

gnx7

iTrader: (28)

What I've read and PM'd people about is this:

LS1/LS6 block beyond 700rwhp that is in a daily driver will eventually lose ring seal. Honing the bores and installing new rings cures this. If it is a race car only you won't put enuf miles on it anyway to have this occur.

LS2 blocks don't have this problem due to a different design. There are quite a few making 1000rwhp and actually driving them on the street with stock sleeves (for how many miles I don't know).

If you plan to make over 650rwhp go LS2 or iron block. Cheap insurance.

I can't wait to see what kind of power Matt is going to make. Should be wild.

THE_SUPRA

...when i grow up i want to be you!

fash00

iTrader: (10)

My setup is slowly going together and will see 1100 rwhp minimum and see a good bit of street duty and lots of track action stock ls6 block,stock treated,crank and forged internals

THE_SUPRA

sounds liek a cool setup...any more details?

cantdrv65

iTrader: (3)

If Harlan says the stock block and crank are fine to 1200rwhp, its obviously because he has proved it with a low 8 second pass at over 170 mph pass or two....Id tend to take his opinion on that matter over ANYONE else on this site.

DOC OTIS

iTrader: (9)

I would be more worried about getting oil through the motor than whether or not the block will hold it. I don't think I've heard of anyone actually breaking a block. The problem is oiling, keeping the heads down, and after market sleeve problems (that have seem to have gotten better over the years).

You guys shooting for 1000 + RWHP I guess your all running dry sumps?

WS6TransAm01

iTrader: (13)

Nope, Paul's TT motor is still a stock oil system with the exception for the tyrbo oil pick up and return.

mramay

iTrader: (4)

The Will Handzell book, "How to build High Performance Chevy LS1/LS6 V-8s", has an entire chapter (#9) on building a gen III 1200 HP engine. They are using the C5R block and give part numbers for the whole thing, with fifteen pages of instructions and pictures on this "how-to."

Enjoy,
Mike

Wnts2Go10O

iTrader: (12)

see what we need is a sponsor or private builder ballsy enough to find the limit of these blocks just for reference sake..

Mike @ New Era

iTrader: (10)

Here is one thing you might want to add to it if you are using an ls1 block for that power level :

http://www.neweraperformanceparts.com/default.asp?S=503&A=E&PKV=dmegstls1|0

It's pricey , but it will help .

Mike
www.neweraperformanceparts.com
sales@neweraperformanceparts.com
585-865-1832

MiaSSmaro98

iTrader: (9)

u can sleeve the stock ls1 block.that will hold alot more but it expensive.

J&J Speed Shop

iTrader: (8)

Cap walking really isn't the problem. Sleeve & block strength around the sleeve is

gen3toy

there are a few 1000+rwhp LS1 cars down under,but they all run the iron block.problems with the stock block have been seen at around the 670/700rwhp mark.the current horsepower hero ran 1200+rwhp on a twin turbo set up,there is a ute running 1000+rwhp [used for drift comps] running a vortech v7 blower,another ute/crewman from the same stable as drift ute has gone 1000+rwhp running another vortech for promo use,then there is a vx ss running a pro charger hes knocking on 1000+rwhp and is driven on the streets daily.a few other but they are the ones that come to mind

Pro Stock John

iTrader: (34)

I'm told that the caps will be fine, but the cylinder bores in the LS1/LS6 will need a hone after a season. I'm told the LS2, since it's siamese bore, holds up better. We'll see.

Reckless

iTrader: (9)

The Ohio boys original motor was an LS1 block and it made 1150fwhp. We usually use iron for high HP app's. We regualarly dyno engines over 1000fwhp in our facility Some are over 1500fwhp.