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Iron block or Aluminum block for high boost?

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Old 01-14-2014, 04:48 PM
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Stay safe and go with a iron block.
Old 02-16-2014, 08:11 PM
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I would go iron, but I know a couple guys running L33 motors making north of 800hp
Old 02-16-2014, 08:43 PM
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l33 here 837/840 20lbs. made over 900 on 23lbs on an aborted run. maxed fuel out.
Old 02-16-2014, 09:32 PM
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^^ sbe?
Old 02-16-2014, 09:34 PM
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yes stock bottom end.
Old 02-16-2014, 09:42 PM
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Wow, these things impress the heck out of me..
I am doing an L33 with ported 799's and a small cam right now for my 79 Malibu, goal is to get 20mpg on the highway and still make at least 600rwhp.. Turbo isn't decided yet, Reed @ Work Turbo will set me up something nice.
Old 02-16-2014, 10:23 PM
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i get like 34-35 highway at the moment. c5z06, 3.15 gears rear mount billet pt7175.
Old 02-16-2014, 10:34 PM
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If you are going to forge the internals of either, I'd just do it to your existing LS1. You'll have more cubes (so it will take less boost to make more power), and you won't be out the hassle of selling it, and looking for a good deal on a 5.3. Plus you'll have more piston options to choose from with the LS1. For what you're looking to do with it, a forged LS1 will hold just fine.
Old 02-16-2014, 10:42 PM
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Too late. Since this thread ive sold the LS1, bought an iron 5.3, boring it to a 5.7 and already got Forged pistons and forged rods.
Old 07-16-2015, 11:27 PM
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any updates?
Old 07-17-2015, 12:37 AM
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He has a build thread on this latest endeavor with theTT setup
Old 07-20-2015, 11:21 AM
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Made 1050whp on a gen 4 alum 5.3 with forged rods/pistons through an unlocked 4L80E.
Old 07-20-2015, 12:07 PM
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Originally Posted by LS1NOVA
Made 1050whp on a gen 4 alum 5.3 with forged rods/pistons through an unlocked 4L80E.
got a build thread? got a TMS forged alum 5.3 waiting to go in mine
Old 07-21-2015, 06:56 AM
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Just search my user name.
Old 07-21-2015, 11:21 AM
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Originally Posted by vettewreck
Will the 317 heads on the LS1 lower the compression ratio down to 9.5 ish?
Yes that is what I did with mine and went with flat top wiesco pistons. I've been running my aluminum 346ci ls1 for 4 years with no major problems. Going to push it to 20-22psi on the new turbo come fall. I was pushing 22psi last year on a pt7675 without issue.
Old 07-21-2015, 11:21 AM
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Forged LY5 here, Id say iron as well.
Old 07-21-2015, 11:22 AM
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****, it's an old thread. Lol
Old 07-22-2015, 12:30 PM
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Its ok, I still read and others can learn from it
Old 07-22-2015, 02:06 PM
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As others have said, I would try really hard to find an L33 pull out, or just the block. Stock crank, good H-beams, Pistons with thick pins, and good rings. Throw some studs in and let er' eat.

Edit: Just realized how much of a bump this is lol.



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