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 **** 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.

 

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?

 

Isn't the C6 a completely new car? 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.

 

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.

 

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

 

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

 

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.