As I descirbed before the headers and Turbos 60-1s are fabbed up and both alum and iron blocks are available. The question really boils down to this: Would the power limits of the LS1 aluminum block be increased enough by destroking and longer rods to make it with stand the rigors of 900+ horses over a short period of time. Will the deck surfaces hold that much cylinder pressure. Are the sleeves too thin.Would this bag the cylinder walls or just crack them. Lets start there.

 

Don't really see the point in destroking unless you'd like to turn your turbo motor at a higher rpm with lower piston speed. Seems like the wrong direction to me unless you split the displacement up into 12 cylinders.
As for the LS1 block, I wouldn't be to keen on attempting this. The block is deep skirted and there isn't much for bay to bay breathing. GM saw that being a real problem (oiling) at higher revs. That's one reason they built the LS6 engine, not to mention the fact that the LS6 got much beefier main bearing bulkheads.
I'd personally go with the iron block as I don't feel the LS1 block could withhold the kinds of stress you're going to submit it to. JMO.

-Mindgame

 

What about the C5-R block?? I believe that is also aluminum, isn't it?

 

Yes sir, it is an aluminum block. Last I read that block goes for about $6,000. You can get a CNC bowtie, Brodix, Rodeck, or Dart for a bit less, so you wouldn't catch me buying one. Besides, Chevy runs the C5-R as a naturally aspirated engine making (from last I remember) about 600 hp. I don't know if the block was actually designed to work on a close to 1000 hp application. Usually they try to keep things as light as they can... providing they don't sacrafice anything strength-wise at their proposed power level. I don't doubt that you could speak with someone at Katech about it if you were serious though. The truth is, I have no idea if they'll support that kinda power.

-Mindgame

 

Try the forced induction or internal engine section of LS1Tech.com for more responses.

I plan to run my 4.060 bore Iron block as a turbo motor but if i sell the block I will run a .010 over 99-02 LS1 aluminum block and try running 15 lbs of boost thru it.

PSJ

 

From what i have seen and been told through my buildup... Short stroke big bore. With alot of stroke they are telling me that there is going to be insane torque.

My new motor is a 4.125 bore, 3.50 stroke setup. Seen like combos make way way more hp then i can ever use so it works for me

Now iron or alum setup.. If you have an aftermarket efi unit I do not forsee many problems with it. If you choose to run the stock computer then i see problems. If you look at the cars that have serious issues they have one common thing 9times out of 10. Stock computer, bad tune, whatever you want to call it.

I think an alum block will be fine, with the setup. My preference would be the iron though. (old school thinking) Now Lingenfelter is getting huge hp numbers out of his alum block cars. So i think it all comes back to the tune in the end.

Steven