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Discussion Starter · #1 ·
I read on another forum that the LS6 block is used for the new LS1 engine....is this true?
 

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IMA,

I thought the LS6 block has the cast "windows" to lower back pressure and the LS1 did not?

Mark
 

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Discussion Starter · #4 ·
I thought there was a difference in the machining for the bay to bay breathing?
 

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This issue is a rather hot topic on the other forum's General Discussion section, under "2002's vs 2001's?"

I posted a picture of the front passenger side of my block for comparison to 2001/02 LS1's, and it seems that the "notch" that supposedly indicates an LS6 block is present on late-2001 & 2002 LS1's.

It makes sense for GM to make only one block. The differences are slight and the LS6 blocks probably cost the same to make as the LS1's. Why have two styles of blocks clogging up the parts inventory.

As one astute poster on the other forum noted, if the LS6 and LS1 short block assemblies are equal, then a LS1 owner is only a cam and head swap away from an LS6. True!
 

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Discussion Starter · #7 ·
Keystone said:
It makes sense for GM to make only one block. The differences are slight and the LS6 blocks probably cost the same to make as the LS1's. Why have two styles of blocks clogging up the parts inventory.
The can of worms is open for business:lol:
Let me start by first admitting that I could be completely wrong about this but.....
I still won't believe it till I see it from a GM source. While it might make $$$ sense to have only 1 block, would'nt it also make sense then to only have 1 intake, cam, head, valves and springs, suspension, rims etc. etc. etc. . I remember it wasn't long ago when some ZO6'ers were concerned about the ZO6 parts being bled over to the upcoming C6 and I believe the GM statement was "no way". The ZO6 parts would be exclusive to that model. I don't know about you folks, but I'd be somewhat disappointed if GM started putting ZO6 parts on C5's. I don't want to sound like an elitist but what's the point of creating a "special Vette" if a few simple bolt-ons on a different model could mimick the original. One of the strong points of the Corvette is that they haven't resorted to the Japanese practice of ensuring a model becomes obsolete within a few short years. Does anyone out there know for sure about this block issue?
 

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There have been several print sources which have done stories on the Z06. Everything that I have read says that the heads and the block are both a different piece.

The Z has the bigger windows in the crankcase for windage control, but also additional renforcement and additional material cast into certain areas of the block.
 

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Discussion Starter · #9 ·
Thats what I thought also...the thread I've read said that they're using the LS6 block in 02 model C5's
 

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VettTheRipper said:

I remember it wasn't long ago when some ZO6'ers were concerned about the ZO6 parts being bled over to the upcoming C6 and I believe the GM statement was "no way". The ZO6 parts would be exclusive to that model. I don't know about you folks, but I'd be somewhat disappointed if GM started putting ZO6 parts on C5's. I don't want to sound like an elitist but what's the point of creating a "special Vette" if a few simple bolt-ons on a different model could mimick the original.
Now we are feeling the pain of the L88 owners of yesterday, where the L88 bubble hood was popping up on Vettes all over town. I'm sure transplanted Hemi's, Ram Air engines, 427 tri-carb engines, etc. were nettlesome to the "orignal" owners of supercars back in the 1960's. This is an age-old problem.

I've already seen too many coupes to count with red beauty covers, red calipers, front air inlet screens, rear brake cooling ducts, etc.. About the only thing I haven't seen (in person at least) is a regular C5 with bogus Z06 fender emblems on it.

You think GM could have at least put "LS6" on the red engine beauty covers to make them unappealing to regular C5 owners who don't want to misrepresent their cars. Within 5 years, half the C5's you see will have Z06 parts on them.

One of the members on the other forum is checking the block on a '99 LS1, to see if the "notch" is on it, so we may get further clarification of this issue. I'll keep you advised.
 

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Discussion Starter · #11 ·
I've seen mention of the "notch" also but I dont think it's exclusive to the LS6.
 

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Here is the notch in question, in front of pass. side cyl. head.
 

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Come on guys, the info is right here in our OWN back yard!

from Dave Hill:

Aluminum Block
The aluminum block casting on the LS6 deletes machined holes in the LS1 bulkhead and adds cast-in "windows" that allow better bay-to-bay breathing. On the downstroke, the pistons push air back toward the crankcase, creating backpressure or resistance, and that translates into parasitic horsepower loss because it resists piston motion. With the overtravel windows, air is allowed to move more freely between crankcase bays, thus relieving the unwanted pressure.

I wish these "new" can of worms on an old subject would get thrown out with the trash:)
 

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Has anybody called their local Chevy Dealer Parts Dept to check the part numbers?
I know the video that came with my Z has a small section talking about what was done to control the air displacement in the LS6 engine at the higher RPM ranges. It leads one to the conclusion that the casting is different from the LS1.
The heads are diff. to increase the comp. ratio up to 10.5:1 vs 10:1, the valve springs have more coils, the cam higher lift.
For 2002, the valve stems are hollow sodium filled, the floor of the intake plenum is lowered, the intake runners were redesigned to allow better air flow, the MAF screen was removed, the air filter inlet was enlarged. All this was to allow the engine to breath more freely for 2002, that's where the addl. 20 HP and 15 lbs of TQ came from. Also, the pistons are not perfectly round, they are oval by a few .000mm, this reduces piston noise. There's probably something I missed, but "this ain't no LS1" I feel comfortable about that.
Stan
02 EB/ModRed
 

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Discussion Starter · #15 ·
fyrcaptain said:
I wish these "new" can of worms on an old subject would get thrown out with the trash:)
Thats not can of worms I was referring to:cheers:
The claim is that in 01, GM started putting ZO6 blocks in regular C5's, and now I hear the intake also is shared. This is contrary to all of the tech articles I'v read.
 

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Mr Ripper,
I hear what you're saying, probably wishful thinking, or maybe some jealousy on some folks part:D
Maybe the same folks that put Z06 emblems and other such Z06 accouterments on their non Z06 Vettes :eek:
If this is coming from some of the folks in the know, or the ones that post and make reliable claims, then it may in fact have some merit.
I'll keep listening:)

The can of worms I was referring to are the ones (and there are many many of them) that seem to get opened up and started on the "other" forum. I got tired of that stuff and only very rarely do I visit there anymore.
Seem less of it over here:)

Just my .02 worth on cans of worms

:cheers:
 

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HI there,
I will post part numbers for the blocks tomorrow for this issue.
Besttoall, c4c5:eek2:
 

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Irregardless

The same block, would still lack the following..........

HEADS( LARGER VALVES), & ON '02'S TOTALLY DIFFERENT SODIUM FILLED

CAM

PISTONS

INTAKE

ADD THESE UP $$$$$$ WISE, AND YOU GOT A WAD.............:)
 

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The LS6 block was different than the LS1 block. (At least in the beginning of the model year 2001). I found the following info. from the 2001 Specialist book: The REVISED ENGINE BLOCK design includes small quarter- size slots cast into webs underneath the piston travel area. These slots help reduce the amount of air the pistons pump, which allows higher RPM. The intake manifold was new for the 2001 MY and is used on both the LS6 and LS1. They may have gone to the LS6 block exclusively sometime in early 2001. (Corvette Black Book)

carzzy
 
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