fatsport

Nope

Yep

No comparison between the LT2 and a FPC.

It’s too bad that GM didn’t push the envelope further with the LT1 & LT2. Looks like GM left a lot of power on the table with the port design. Edelbrock quickly discovered the weakness of the head config and designed around it. Katech also has copied this.
Good article here...
https://www.enginelabs.com/engine-te...ctor-jr-heads/

I’d love to see an LT3 with this simple fix of straightening the ports.

Rkreigh

very cool stuff. I don't understand the comments about a bigger NA engine not being able to pass emissions. even with more stringent regs, with DI, secondary port injection, variable cams, it can be done

a high compression engine can be made very efficient and clean with the right setup and still produce 700+ hp. Why can't an SB4 type head work? clearly it meets the HP targets comfortably

as others said, my OLD LPE LT5 makes 646 hp and 530 torq. does have a stroker crank for 390 displacement, great durability at revs up to 7600

As mentioned, some nicer parts are needed, billet crank, pankl TI rods, forged pistons, good porting. But indeed this is old school and the modern cyl head design blows the old LT5 into the weeds.

Not a problem for gm to build a relaible 700 hp engine JUST LIKE Merc marine does with the SB4. Not rocket science and it can be made very durable.

I think they'll stick with turbos as it makes achieving those goals easier at lower revs with a nice broad shouldered torq curve

boost by speed and variable cam timing will allow a nice traction control capability and lower revs are much easier on the bottom end.

I don't know why so much hate for the turbos, they will bring the car to a new level. Same for the DOHC. Two nice high velocity ports and 4 valves open up the flow and add in the variable cam timing and you have an engine that will compete with the mclarens and ferraris of the world that can be fixed by Joe Blo. Everyone fears this stuff, shouldn't. It's been around for a while and works fantastic. It's high time the c8 engine catches up with the chassis as mentioned.

GM has this capability to roll out high value, durable products, now leverage the engine side of the house and beef up that tranny and kick some @

NineVettes

Pretty much my sentiments exactly. Bought my 2019 M7 Z in Sept of '18 because I wanted the best of the best but I also wanted an Admiral Blue car so, I needed to buy earlier in the '19 cycle since Admiral Blue was being phased out. I think only 3% of the 19s were that color. Very pleased with my car both on the track and on the street with the exception of having to replace two crap GM Mexican wheels - went to Forgeline VX1 Rs . Typical GM corner cutting yet they put forged wheels on the Camaro ZL1 1LE....

As for the C8 - the base holds zero interest for me. If I like the C8 Z, I may jump in '23 or '24 (more likely). I have the title to my car, so that is no issue. More of an issue is if Ilike the C8 Z a lot more than what I am seeing now and if it is using an FPC over 4.5 liters. After my '17 Shelby experience, no more large displacement FPCs for me. Price will also be a consideration.

vettesweetnos

Too bad it's twin turbo and not na...

40YRW8

I have put 124,000 miles on my personal hot rod, a ‘07 Z06. I built this car up to be everything I wanted in a hot street car. I have no idea what will be coming from GM but this is what I would like to see in the Z06 (the ZR1 can have the turbos.). Coming from the LS7 what I would like is a 430 ci. cross-plane crank, DOHC engine with titanium rods and valves, a 7500 rpm red line with 675 hp and 640 lb ft of torque and a torque curve flatter than my first girlfriend. I don’t race my Z so I am looking for a street application put in a C8 with about 150 pounds less weight. Does anyone remember the reaction the 2006 C6Z got world wide with no bells, no whistles and just an excellent combination of smooth torque and low weight? That is where I live every day on the street. My Z only has 560 hp but only weighs 2851 pounds. It is impossible to explain just how much fun this car is to drive as a daily driver. Anyway, guys, keep digging for the truth and I will be here watching since GM probably (I mean will never) build exactly what I want for a whole list of reasons. The C6 Z06 is as close as any car company has ever come to that and they were pretty darn close. Just 6 months ago I swore that I would be buried in my car but the C8 has me saving for another down payment and a 2021 build date.
Cheers!

Kodiak Bear

Turbos are great for peak power. As long as the engine doesn't blow up or melt down, just keep twisting the boost screw and the power comes out.
BUT, drive-ability and reliability are a different story.

The Texas tuner claims 650hp within the limits of the present fuel system programming. I haven't the foggiest idea how the car drives.

I would be very worried about magazine bad mouthing turbo lag, and home mechanics tinkering with the boost. They are headaches GM doesn't need.

For the street, NA or supercharged seems the safer route

NytmereZ

The OP must be bored, like every other person in this country right now, but you dont have to be delusional , no way in hell the Z06 in NA, it will be TT and it will have a minimum of 45 more HP than the C7Z

VETFEVER

How do you know it will be a Turbo? In this month’s Car and Driver they are saying the following:

NA
DOHC 32 valve
5.5 litre
flat plane crank
8500 redline
600+ HP

This would be an absolute screamer of an engine. And these specifications line up with early reports that Chevy was going back to the variants they built for the C6 where the Z version was all about NA and fast/high revs. The ZR1 variant would then be FI.

And ultimately electric motors would be added to the front wheels (possibly in s Zora variant) to bring the car into the 1000 HP area with all wheel drive.

Just sayin

PRE-Z06

Based on Hennessey’s results of adding ~200hp with turbos and no tuning, makes me think the engineers left a lot of room on the table with the LT2 as what other engine has that much room for increase with stock compensation of factory tune? There’s not that big of a DA swing for a NA engine to need that much resolution in the stock MAF and injectors.

Prop Job

Would be nice if GM would just give us a little nibble to brighten up these dark times.

VETFEVER

Total agreement there!!

DDSLT5

Sure. 200 hp. More like 20 hp.

PRE-Z06

They didn’t run it from a dig down the track which I assume is because launch control probably doesn’t work too well and they’re on the runflats, but he does some pulls from a roll and it made 640rwhp on the dyno.

Racer X

One clue is the engine planning document that was leaked in maybe November 2017. It was a plan through 2021 or 2022. It showed 3 engines for the C8. The released 6.2 L NA and two DOHC twin turbo engines 5.5 L and 4.x (2 or 4) I don’t remember exactly but not was. Else in the document it said they had engines designed for up to 850hp and 720 lb/ft . I interpreted that to be 5.5 TT engine based on all of the engines in the document that covered all GM models.

We know that it was GM because asked it be taken down, just like they did with CAD drawings of the C8 leaked that showed the DOHC TT installed.

Official things could have changed. So believe unsubstantiated click bait if you want.

Mid8tracker

Any guesses for the weight?

I can see big differences between turbo and NA.

LTC Z06

The 3.5L TT in my wife's 2017 Ford Explorer is amazing. 365HP, 350TQ and if it has any lag I can't detect it, didn't know it was a turbo until after the test drive. They can sound great, not the same, but great.

NytmereZ

1.common sense
2. never believing anything Car and Driver(or any other click bait publication/magazine publication) says

kutlow

I'm surprised nothing else has leaked out on the z.

GrandSport 2017

N/A 5.5L is coming

mdull

You are so right - it will be twin turbo there is no way GM is coming out with a NA FPC that will have no more maybe less TQ than the base. to get anything out of a FPC you have to get up into the hi revs which won't be great on the street at all. Might be great for the track but would suck on the street