Whats GenIV about the vette 6.0?

Reading the latest MT article, it calls the 6.0 Vette engine "GenIV".

Aside from a bump in displacement and some slight changes to breathing, is looks like a GenIII to me. Am I missing something here?

From what I have seen the heads are interchangable as well as most of everything else. Its a marketing gimmick. Just like the C6. C6 my arse the C4 had a much larget change in its life span than the C5 to C6.

I agree the fact that GM used the RPO code LS for the LS2 even hints that this 6.0L is just a revised Gen III LS1-LS6. There is nothing new and completly changed from the LS1-LS6 like there was from the LT1 to LS1.

The GenIII was a completely revised engine over the GenII. But the heads on the GenII LT1 were interchangable with the old GenI SBC's. It's a similar situation with the GenIV. If you thought the GenII was a new generation of motor, then the GenIV must be also.

Originally posted by Burmite
The GenIII was a completely revised engine over the GenII. But the heads on the GenII LT1 were interchangable with the old GenI SBC's. It's a similar situation with the GenIV. If you thought the GenII was a new generation of motor, then the GenIV must be also.

Well they'll bolt on, but you wouldn't want to run em. The LT1 is reverse flow cooling. Plus the gear drive waterpump was new and sucked. Plus the gear driven Optispark was new and sucked.

But for the most part the mechanicals are the same. Rods,cranks,pistons...

So what's new about the GenIV? Most likely provisions for DoD right?

Originally posted by Evil Turbo SS
C6 my arse the C4 had a much larget change in its life span than the C5 to C6.

Isn't the C6 a completely new car? :confused: And personally, I think an early C4 looks much more like a late C4 than a C6 looks like a C5. Other than the proportions, the C6 looks completely different to me.

i think the 3v heads and DoD provisions are the only real thing different from gen 3
so basically, that is enough to call it gen 4
i think of it sort of as a publicity stunt, but then again, it is a departure from the normal 2v heads and no DoD

o, and also, i think because of the variable cam phasing
that could also be another reason it's called gen 4

Well, the difference between the the C6 and C5 is evolutionary, whereas the difference between the C5 and C4 was revolutionary. Thats fine with me, the C5 is a damn good starting point, more refinement and tweaks are really what the C6 needs, not a clean sheet design. I'd rather GM spends it's resources on refining the design at this point, rather than creating a new set of problems.

The difference between the GenI and GenII is huge as stated above (reverse-flow cooling, opti, gear driven WP, coolant-free intake manifold). The difference between the GenII and the GenIII is huge (aluminum block, replicated ports, individual coil packs, new valvetrain architechture, conventional WP)

The 6.0 Vette engine is really just a GenIII with different dispalcement and tuning. Maybe it is "ready for DOD", but untill it actually shows up, its misleading for GM to call this a GenIV.

The C6 is a rebody of a C5 with the rear drop out subframe steching the wheel base. The word was that the frame was going to be the same but made from alum. It isnt even that. The ZR1 had all new body panels except the hood when next to a L98 car. That wasnt called C5. Didint the C2 or first gen Corvette Have two Bodies on the same frame?

The Gen II SBC was a attempt at keeping the old SBC emmisions compliant. Its a SBC with a Opticrap and the coolant going thru the heads first. It Still is just a SBC with tweaks. Its more like SBC V 1.5. If I put a C.O.P. MSD ignition and SBC 11 degree heads on a SBC is it now a all new engine? The 400 SBC had a new block, crank journal size and coolant passges. Its just as new as the LT1's in the 4th gen but was marketed asa all new motor. The Ls1 was a All new Pushrod motor. The Ls2 is a newer version of it. like a 400 or new casting # heads eben less that that.

Originally posted by Evil Turbo SS
The C6 is a rebody of a C5 with the rear drop out subframe steching the wheel base. The word was that the frame was going to be the same but made from alum. It isnt even that. The ZR1 had all new body panels except the hood when next to a L98 car. That wasnt called C5. Didint the C2 or first gen Corvette Have two Bodies on the same frame?

The Gen II SBC was a attempt at keeping the old SBC emmisions compliant. Its a SBC with a Opticrap and the coolant going thru the heads first. It Still is just a SBC with tweaks. Its more like SBC V 1.5. If I put a C.O.P. MSD ignition and SBC 11 degree heads on a SBC is it now a all new engine? The 400 SBC had a new block, crank journal size and coolant passges. Its just as new as the LT1's in the 4th gen but was marketed asa all new motor. The Ls1 was a All new Pushrod motor. The Ls2 is a newer version of it. like a 400 or new casting # heads eben less that that.

ZR1's weren't called C5's? They were C5's--and the general public doens't use the term C1,C2,C3,C4,C5.

I'd really argue you on the body panels but my info is ont with me.
The only difference I know for sure is that the rear fenders were wider to fit the 315 tires.\

Even if it did have some more different body panels--the basic arcitecture was the same a L98.

Originally posted by 305fan
ZR1's weren't called C5's? They were C5's--and the general public doens't use the term C1,C2,C3,C4,C5.

ZR1s were C4s. I think Evil's point was that the ZR1 was very different from its C4 stablemates, yet Chevy didn't choose to bump up its nomenclature from C4 to C5.

ah...damn..don't I look dumb. I know they are C4s...my brain was MIA:shame:

I don't know, I consider all the provisions for DoD, the 3 valve heads, etc enough to warrant a nomeclature change.... Sure the DoD isn't enabled apparently due to a harmonics issue in the C6 when running on 4 cylinders, but that's still a pretty big advancement I'd think... Maybe not, I don't know, who really cares what they call it?

I'm just excited to hear they dropped 15lbs off the engine while at the same time increasing power by about 50hp. They can call it whatever the heck they want as far as I am concerned:D

Originally posted by Ray86IROC
I don't know, I consider all the provisions for DoD, the 3 valve heads, etc enough to warrant a nomeclature change.... Sure the DoD isn't enabled apparently due to a harmonics issue in the C6 when running on 4 cylinders, but that's still a pretty big advancement I'd think... Maybe not, I don't know, who really cares what they call it?

The C6 6.0 has neither DOD or 3 valves. When it does, then they can call it a GenIV. Untill then, its a GenIII.

Besides, what provisions DOES the 6.0 Vette have for DOD? I would bet none, because its unlikely it will ever get DOD.

The Vette gets good milage already, and the typical Vette buyer makes enough $$$ to not be concerned with milage.

The new Cobalt will get DOD before the Vette.

Originally posted by PGR
The C6 6.0 has neither DOD or 3 valves. When it does, then they can call it a GenIV. Untill then, its a GenIII.



That's the way I see it too.

As I understand it the block has all of the provisions/oil passages and whatever the heck else to run it. I'd be surprised if they don't offer it on the C6 after a year or two.

So the standard 6.0 doesn't have the 3-valve heads? Hmm, thought they did.

DOD is a Computer controlled shut down of fuel injectors and ignition coils. Im sure that you will see aftermarket DOD for the hot rod show cars a few years after its out. Doesnt amke the engine differant. They have 4v heads for SBC SBF BBC BBF and LT1s. If they offer a 3v head its like saying that the 4v cobra motor is not a mod motor because it has different heads. Still the same engine family.

So is the "new' LS2 basically the same 6.0L truck engine with new heads, cam, & low restriction intake manifold. Or is it a completely different block that has been in trucks.

It's not the same block as the 6.0 trucks.

The LS2 still has a 4.4 bore center, but with a 4inch bore.

It's definately an evolution, not a revolution. It has high-flow cylinder heads, performance valves, with a 13% increase in valve lift, and a 40% increase in throttle bore area.

It flows much better with a 30% increase in induction, and a 10% increase in exhaust flow over the LS1.

It has a Siamese bore and a new casting process. The engine is stiffer while offering less mass than the LS1 (also, it's 15lbs lighter). It also keeps the same low emmissions as the LS1.

The engine is supposed to deliver 400HP@ 6000RPM, and 400FTlbs of torque with 90% of that available between 2500 and 5800RPM. Also, the redline is increased to 6500RPM.

So yah, more displacement, power, less mass, etc. But not a huge huge difference over the GENIII. Someone else probably know more than I do.

EDIT: I think the engine is a little shorter too... but I don't know if that's for sure:p

Thanks for the info:) I have gotten the new MT and C&D which both feature the C6 in but have not had a chance to read all of the details yet.

MT, C&D, and AutoWeek say the LS2 is 15.4lb's lighter than the LS1. And the ci is up from 346 to almost 365. SO new pistons, crank, heads, intake and valvetrain.

TO me its an updated Gen III, like the LS6 was over the LS1 just more so. Like the LT4 was over the LT1.

To me the Generation of the SBC changes when the block changes. I guess we won't get a major change in design until something is found to better the LS series engines. After head, valvetrain, and displacement changes there are not many more that can be changed besides the block. And until a new material thats found to be better then aluminium is found and used there won't be the major change like from the LT1 to LS1.

IMO GM shoulda just said this LS2 is a new engine different from the LS1-LS6 but not so different that it should be labeled Gen IV. Yea I hate to say it but seems like a marketing ploy more than a engineering or fundamental change.

Either way I'll take the 400hp/tq especially if it finds its way into a 05 GTO! :bow:

Here's a link to GMInsideNews that details the GenIV changes:

http://www.gminsidenews.com/forum/index.php?showtopic=3171

Yes, the block is new, incorporates provisions for DOD, and moves knock sensors to a more servicable location. Gull wing oil pan is gon, and oil capacity is down 1 qt.

But hey, these differences are no more significant than the variations we see on the currentGenIII (iron blocks on trucks, different cams and exhaust etc.) or even the GenII (iron heads on Impalas, roller rockers on LT4's)

Whatever they want top call it, I'm glad they made these changes. DOD ready? Great! Easier servicablity? Awsome. More reliable water pump? Fantastic! 400hp, 400ft-lb? Yeehaw!!!!

I thought they were gonna hold off on the next generation of the small block till 2-3 years down the road.. I thought i read that somewhere. 3v heads and other new stuff was supposed to be later in the c6's life since they havent had time to develope it all yet. I might be confused but I could have sworn I read that b4.