Iron block or Aluminum block for high boost?

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Jan 14, 2014 | 04:48 PM

#21

Blackpanther99

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From: Baytown, TX

Stay safe and go with a iron block.

Feb 16, 2014 | 08:11 PM

#22

matt477

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From: Pinckney, MI

I would go iron, but I know a couple guys running L33 motors making north of 800hp

Feb 16, 2014 | 08:43 PM

#23

ZGLASS

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From: Federal Way, Wa

l33 here 837/840 20lbs. made over 900 on 23lbs on an aborted run. maxed fuel out.

Feb 16, 2014 | 09:32 PM

#24

StrokerTA

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^^ sbe?

Feb 16, 2014 | 09:34 PM

#25

ZGLASS

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From: Federal Way, Wa

yes stock bottom end.

Feb 16, 2014 | 09:42 PM

#26

StrokerTA

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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.

Feb 16, 2014 | 10:23 PM

#27

ZGLASS

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From: Federal Way, Wa

i get like 34-35 highway at the moment. c5z06, 3.15 gears rear mount billet pt7175.

Feb 16, 2014 | 10:34 PM

#28

CALL911

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From: IN

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.

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Feb 16, 2014 | 10:42 PM

#29

vettewreck

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From: Raleigh, NC

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.

Jul 16, 2015 | 11:27 PM

#30

mguyfer

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From: Oshkosh, WI

any updates?

Jul 17, 2015 | 12:37 AM

#31

SCott5

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From: NC

He has a build thread on this latest endeavor with theTT setup

Jul 20, 2015 | 11:21 AM

#32

LS1NOVA

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From: Minneapolis,MN

Made 1050whp on a gen 4 alum 5.3 with forged rods/pistons through an unlocked 4L80E.

Jul 20, 2015 | 12:07 PM

#33

Spectre86

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From: Oregon

Quote:

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

Jul 21, 2015 | 06:56 AM

#34

LS1NOVA

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From: Minneapolis,MN

Just search my user name.

Jul 21, 2015 | 11:21 AM

#35

willizm

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From: Joliet,IL and Las Vegas 50/50

Quote:

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.

Jul 21, 2015 | 11:21 AM

#36

MonmouthCtyLS7

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From: Rotonda West Florida

Forged LY5 here, Id say iron as well.

Jul 21, 2015 | 11:22 AM

#37

willizm

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From: Joliet,IL and Las Vegas 50/50

****, it's an old thread. Lol

Jul 22, 2015 | 12:30 PM

#38

vettewreck

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From: Raleigh, NC

Its ok, I still read and others can learn from it

Jul 22, 2015 | 02:06 PM

#39

DEFYANT

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From: Okmulgee, OK

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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