350-Z28

iTrader: (2)

Alright I'm a little frustrated with trying to find info on how much the factory LSX aluminum blocks can handle. I sold my LS1 with the knowledge that it would handle over 1000 HP and then someone says it will. I'm curious how much can a factory LSX aluminum block take before it begins to fail. Would it need to be re-sleeved to handle it? Just let me know if anyone knows what the maximum horsepower is that the aluminum block can take before failure begins to occur.

ArcticZ28

iTrader: (14)

I don't have first hand experience, but I'd say 1000 would be the limit. I've heard of people running an LS1 block bored .030 in a 800+ hp application and it's holding strong. I haven't personally heard of anyone running 1000+ reliably in an aluminum block.

Gold Z

iTrader: (3)

If in doubt, use the iron 6.0 liter LSx block.

KCS

iTrader: (20)

I didn't think you could bore an LS1 .030" over? #.905/3.908" the limit with stock sleeves right?

As for the original question, the LS1 block can handle 1000hp, I don't think anything will actually fail/break unless someone messed up during assembly, but the bores will move or flex. I personally haven't built an LS1 with 1000hp, but thats just what I've heard/read.

speedyss

I have seen plenty of twin turbo ls1's puting out well over 1000hp, if you use a gurdle that will improve the strength greatly.

ArcticZ28

iTrader: (14)

You can do it and people do. Like I said, someone just did it and is making good power with no problems. Also, why would JE/Eagle/etc make pistons for a .030 over bore in an LS1 if people didn't do it?

pist0lpete

iTrader: (3)

You cannot bore it that much I dunno if you have ever been into an LS1 but the liners are something like 1/8 of a inch thick. I would not want to chance boring a stock block that much. Now if you were to sleeve the block thats another story. The reason people make these pistons is for Iron block LQ9/Ls2 motors etc.(the use the same pistons) and for sleeved applications. To bore stock ls1 sleeves .030 over is a horrible idea.

ArcticZ28

iTrader: (14)

Tell that to the guy running a .030 bored LS1 in his 850hp all out race car because for some reason he believes that his motor isn't imaginary, but I guess he's wrong. I personally don't care whether people believe it or not and have been in my engine many times. Just be aware that there are such things as internet hype and maybe this falls into that category.

350-Z28

iTrader: (2)

Well I was thinking about the LSx iron block for a while, when it comes down to it you will hardly notice that added weight in a 1000+ hp car. I also thought of a C5R build or an LS7 build but those are far too unrealistic. Looks like the iron block it is. Has anyone ever heard of a destroked iron block set up to rev to oh say 10-11k RPM? I was debating doing a high revving motor with big boost, but i thought the destroking would sacrifice too much torque

BlackHawk T/A

iTrader: (3)

There are no parts on the market that can handle that kind of RPM. By design, the motor will just not do it and stay together. Besides that fact, that is absolutely no need to rev that high.

350-Z28

iTrader: (2)

I just thought I might build something a little different, the idea was sparked by reading an article about the 69 Z28 Camaros equipped with a 302 with factory redline at 7,000, but with a race build revved to 10,500 all day long on the old school small block design. Just thought it might be neat to try and build a third gen for that.