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I'm going to be doing a bit of maintenance upgrades on the top side of the engine. As if I'm not spending enough time and money, I've decided to replace the valley cover to the ls6 style. Supposedly, it will consume less oil and create slightly better oil pressure. Plus clean up the engine a tiny bit of the ugly hoses. I BELIEVE my 2001 ws6 has the ls6 block. I can't see the "bulls eye" marking on my block. I do not want to bother notching my engine to make the valley cover fit. Am I correct that my block is the ls6 version?
Some LS1s shared/used the improved LS6 block. They were still LS1s with 241 heads but the block had some differences.
when using a LS6 valley cover on a Ls1 block you have to do some trimming to make the cover fit. On a Ls6 block, it bolts right on.
Safest way to tell is pull the cover off just to be sure. I know it sounds like a pain.
Some LS1s shared/used the improved LS6 block. They were still LS1s with 241 heads but the block had some differences.
when using a LS6 valley cover on a Ls1 block you have to do some trimming to make the cover fit. On a Ls6 block, it bolts right on.
Safest way to tell is pull the cover off just to be sure. I know it sounds like a pain.
I guess I'll find out, lol. Then it'll be the point of no return and I'll probably bring out the Dremel. Ugh. Hopefully I won't have to do any other modifying. I'm still a bit confused as to what to do with the steam tubes. I've read they sometimes get in the way of the ls6 Valley cover.
I'll stay positive, I'm 90% positive my car has the ls6 block.
LS6 is different from a PCV standpoint so with that said I don't believe you have an LS6 because you don't have the LS6 valley cover with the built in PCV.
The LS6 was originally only used in the high-performance C5 Corvette Z06 model, with the Cadillac CTS V-Series getting the 400 bhp (298 kW) engine later. The V-Series used the LS6 for two years before being replaced by the LS2 in 2006. For 2006, the Z06 replaced the LS6 with the new LS7.
Last edited by 01CamaroSSTx; Feb 18, 2021 at 06:30 PM.
On the steam tubes: block the rears and use a Ls6 style crossover front. I have also seen a cross over on the front and rear if you do t want to block them.
On the steam tubes: block the rears and use a Ls6 style crossover front. I have also seen a cross over on the front and rear if you do t want to block them.
Pardon my ignorance, but do would I have to do that even if I have the later intake manifold?
On the steam tubes: block the rears and use a Ls6 style crossover front. I have also seen a cross over on the front and rear if you do t want to block them.
About 25% of the 2002 production run are rumored to be LS6 blocks. I've seen pics of some LS6 block 4th gens. The actual numbers are in dispute though.
Here's the LS6 engine specifications and it's really only heads and camshaft that set them apart from an LS1. Well those and the block casting number and the fact that they were also drive by wire.
Here's another thread on LS1Tech regarding the LS6
LS6 block was slightly different internally to allow better bay breathing. Probably not much difference in reality.
True, but I'm so relieved to not have to cut the block to make the ls6 cover fit. Especially after the fried I went through removing the intake manifold and valve covers. I have no idea how some people can do those things so quick.
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ls1 to ls6 valley cover replacement 
