JAYZZ06

iTrader: (-1)

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

PREDATOR-Z

Little oil galleys on the main bearings to help with crank journal lubrication. (LS6)
Less weight (minimal if you ask me). (LS6)
For 800+ hp, the LS1 is a stronger block.

Colonel

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?

Fast SS on TNT

iTrader: (1)

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.

427

iTrader: (3)

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

PREDATOR-Z

Colonel, that is what makes the LS1 stronger. The LS1 is void of these. Of course this doesn't apply to anything less than 700/800 rwhp, after that the LS6 is like our timing chains, lifters etc.. "A hit or miss situation"
How many resleeved LS6's do you see running around?

C4VetteLS1

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...

ktmrider

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! ).