whats the difference? ls6 block-ls1 block?
whats the difference? ls6 block-ls1 block? i just bought a ls6 block and im wondering if the rolling assembly is the same as an ls1? and if so what is the advantage of a ls6 block over the ls1? thanks
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Predator, that's the second time I've seen it posted that the LS1 block is actually stronger. Maybe it was you that posted it before, I don't recall. I'm not at all refuting what you're saying but I am wondering what you base this on? It's always been my understanding that the actual metal that the LS6 block is made of is far stronger. Maybe that a buncha poohey, I dunno. So, what's the scoop?
I've talked to two different engine builders, and they both agreed on one finite point....the LS1 block is stronger, but everyone wants an LS6 block, so it cost more.
I won't name either builder. But for all intensive purposes, I'm using a truck block for my 408 stroker.
I won't name either builder. But for all intensive purposes, I'm using a truck block for my 408 stroker.
Not sure there is any clear advantage to either block.
The ls6 block has small "windows" at the base of the bores to help with windage concerns. The cam bearings are bigger if the block was machined after september of 03. The head bolts changed on the newest blocks to all one length. Not sure what month this started, but we started getting the new style in March. There also drilling and tapping the timing chain guide holes in the blocks again like the pre 98 blocks.
Kurt
The ls6 block has small "windows" at the base of the bores to help with windage concerns. The cam bearings are bigger if the block was machined after september of 03. The head bolts changed on the newest blocks to all one length. Not sure what month this started, but we started getting the new style in March. There also drilling and tapping the timing chain guide holes in the blocks again like the pre 98 blocks.
Kurt
Originally Posted by JAYZZ06
i just bought a ls6 block and im wondering if the rolling assembly is the same as an ls1? and if so what is the advantage of a ls6 block over the ls1? thanks
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by 427
The ls6 block has small "windows" at the base of the bores to help with windage concerns. Kurt
How many resleeved LS6's do you see running around?
Banned
Joined: Sep 2002
Posts: 1,298
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From: So Cal, CA
LS1 blocks are much better choice for any type of huge horsepower setup. The webbing is stronger in the blocks, also when using the blocks for resleeving big bore setups, ls6 blocks seem to always hit water jackets (which the sleeves seal back up), all the ls1 blocks weve sleeved do not hit water when bored out before installation of the new sleeves. Plus ls6 blocks are often brand new ones that people are using, i would want a seasoned LS1 block hands down over a ls6...
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Joined: Apr 2003
Posts: 1,109
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From: Albuquerque, NM
427 is right, the "windows" help air currents at higher RPM's from causing oil pressure and flow issues ( note high RPM's ). But it also causes reduced structural rigidity.
You building a short stroke screamer, get the LS6. For everything else, use the LS1 ( or bore out an iron 4.8/5.3 truck block like me, wink! ).
You building a short stroke screamer, get the LS6. For everything else, use the LS1 ( or bore out an iron 4.8/5.3 truck block like me, wink! ).
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