transam69230

iTrader: (49)

Well I am building a twinturbo setup with an ls3 block and I know it is not the most ideal block to use but it is what I have. So with that in mind I am looking for 1000rwhp out of this thing. It will be street driven on the weekends.

-Twin TC 76/68s
-TFS 245s
-Custom liljon cam
-e85
-triple pumps


Those are the basics. I don't have a problem running a huge oil cooler, but I want to know if people have done it? What are people's opinions on it and if you think I won't have issues keep it cool.

Grr

iTrader: (2)

If it makes you feel better, fill it up to the bottom hole at least, wont be a problem with an oil cooler

Danny

iTrader: (16)

I'm going to do a 1/2 fill on my LS3. I'm also planning on pushing 1100rwhp thru it.

typhoon1015

iTrader: (5)

my 4.3 is half filled, and it runs fine with A/C and a FMIC as well. Do a small or half, shouldn't have a issue.

transam69230

iTrader: (49)

How about oil temps? You running a oil cooler?

stock48

iTrader: (17)

I don't see what a short fill would hurt. Does block have windows above mains or solid?

typhoon1015

iTrader: (5)

I am running the stuck s-10 oil cooler in the radiator, but I have not checked any oil temps at all.

A oil cooler wouldnt be a bad idea really.

Inspector12

iTrader: (29)

Well I will say you can do what you want, and if you want to fill it go ahead and do it. Most of the fillers do say something about not using on an aluminum block because of the expantion and contration they do vs an iron block etc... I am and have run multiple ls2's at the 1000-1200rwhp and haven't had any issues and I have never filled any block. But if you think your doing something to help yourself go ahead I always like to encourage ppl to do what they want so we are not all rolling around here all running stock 5.3's and 4.8's with turbos lol! But all am saying is there is no need really! But GL with your build.

TheLS1Lover

The real question is WHY fill the block? The LS3 block is more than capable of withstanding 1000hp. I see no need to fill it.

91sonomast

Kind of my thoughts. I'm not an engine builder of any sort but I know I have seen a number of them taking 1000-1200hp not filled.

typhoon1015

iTrader: (5)

It's holding the HP for a longer period of time. It is known that caps walk and the block can flex and move around a bit. By filling the bottom of the block, the lower end will stay together longer, and wouldn't beat up the bearings as bad. Same kind of prevention like pinning the mains.

p8ntslinger676

you'll lift the heads long before you need to fill the block. its a waste of time and money. if you're worried that much just get it sleeved and call it a day. ive seen people make 1200 wheel all day long with no issues on the stock block

Inspector12

iTrader: (29)

BS! Yeah they move,SO, mine have lived VERY long periods of time between freshing up and even then its usually me just wanting to check them out becuse I'm doing something else etc... And I have multiple friends doing the same thing as me and not any real issues with the mains etc... GL!

LS1NOVA

iTrader: (12)

You guys have any links or info on the these setups making 1000-1200whp on a LS3 block? LS3 or L92 6.2 block ONLY since thats whats discussed here.

91sonomast

Particular engines have these kind of problems, I don't think an LS3 with 1000hp will. For example the Dodge Magnum engines, once you start talking 700hp and boost you need to do a half fill on them or go to the R3 block. But that's subject to change on each engine platform and engine specific.

LS1NOVA

iTrader: (12)

Anyone?......

Inspector12

iTrader: (29)

I know of three here in Houston, but no build threads on the cars (2 416's and 1 370). So no I didn't post a link lol! But hey if its not on the internet, it didn't happen right. Besides it was the core shift that made the LS3's and L92 not as nice as the LS2's not anything to do with the mains. They just had the sleeves way more off than most of the other blocks so in some cases they had significantly less material around the sleeves. So I would be way more concerned about that than the mains/ filling the block etc... But thats just my opinion and like I said earlier why are we even talking about it. Just do it if you want, its not like thats going to brake the bank etc... GL!

LS1NOVA

iTrader: (12)

The 370 isnt going to be a 6.2 block btw.

Dont you think the purpose of the block fill is to strengthen the area around the sleeves? lol.

Im sure the idea behind the queston was since this is a street car, is the cooling ability going to be greatly reduced and was looking for guys that have done it, not just "oh yeah 1000 is cake dont worry" replies from guys that have no personal experience doing it.

SilverSS

iTrader: (30)

Can't say much for an aluminum block but my iron block is almost a 3/4 fill and is all street. I good oil cooler is a must and keeps the oils temps happy. It can be driven all day in the hot TX weather. The block is rock solid and will not push a drop of water on hard runs and a maxed out F1A with stock head. Maybe the hard block is keeping the cylinders from moving around? My last build would lose some water without the fill. Maybe it works for something?

Inspector12

iTrader: (29)

Yeah go ahead and try to critic my post if you want bro its not helping you with anything, its a stock LS3 with a stock crank too making over 1K so what ever the CI is I didn't care to be THAT specific. You LMK when you get the perfect set up that no one in all these years could figure out! And your wrong about filling the block strengthing around the sleeves cause if you don't fill it up all the way there are still places that don't have support around them. But like I said if it makes you feel special and all warm and fuzzy inside go ahead no one is stopping you! I never have needed to do any of that fancy ****. I just build them meticulously and they hold up. GL!