Any idea what kind of testing was done on the new engine? It sounds awesome but is really unproven (production wise) regarding the 13:1 compression ratio and other nuances like the induction system and new lubrication setup. As the car is produced and sold miles driven will reveal any issues if there are any? I read this small block will also be used in their truck lines but not sure if it will be a 13:1 version in a truck. Could be? The LT2 seemed to be a good reliable engine. I’m guessing GM wouldn’t provide a warranty unless they felt good about it. But they warranted lots of truck engines that had AFM liter issues that were expensive to fix, if they fixed them at all. Many horror stories about not honoring warranty for lifter failures. That never seemed to be a huge issue for the Corvette engines. I read the new AFM system was moving away from the lifters to hydraulic rocker arms. All this stuff has to work reliably including the direct and port injection. Like I said the new engine sounds awesome! Just hope all the design features have been adequately vetted.

 

User testing. Coming soon.

 

I wouldn’t sweat it as nothing really new. My old F-150 with 5.0 had 12.5:1 compression, had both port and direct injection and ran on only 87 octane, really liked E85 though. My new Ram with Hurricane has the continuously variable psi oil pump like the new LS6. Pistons and connecting rods are now forged, it still has a shorter stroke and lower rev limit than the LS7 had too.

 

Do you think manufacturers make engines and don't test them? They have to honour a 5 year powertrain warranty. They would lose their shirt on them if they made a new engine with barely any testing. Production engines see tons of miles during R&D.

I'm not saying they will be perfect but you have a warranty if it has issues and if not you can wait a few years for any problems to be ironed out if you don't want to be an early adopter.

 

GM is testing their gen 1 2 3 / replacement already

 

The LT6 testing started in 2016 and didn't make it into a car until 2023. They didn't design it last week and hoped for the best.

 

I hope it was tested better than the 2001 z06 LS 6 was. Buying a first year car that was tagged as an “ oil burner “ then having the fix and a 20 HP bump the next year taught me to never buy a first year GM engine.

 

I was in a test lab as a customer on an aerospace project and saw an engine undergoing extensive physical environmental (Climactics and dynamics) testing. They had to chase me away several times and wouldn't tell me what it was.

Turns out it was the LS9.

 

And that turned out great.. Oil leaks from any number of places and effecting all years, the ticking tsb? They are far from perfect. Fire bomb in the making? Or do we forget about that stuff?

I get what the op is saying. One strange thing I noticed on the LS6 is the fuel injectors are going though the valve cover? So another 4 seals per side that can leak on a simple valve cover? Still using ohv tech but beginning to get as complicated as a dohc without the benefits. Weird.

It does not appear that Mfrs design these types of ultra hi performance engines to last the life if the car just maximize what they can and meet emissions and mpg goals. They make sure it'll make 100k mi and call it a day. In a vette? Wont be an issue. Let's see how the truck engines do.

So many examples of this over the years. LS7. 8 speed auto trans in C7s (and all other gm vehicles that had them) took them 4yrs to figure out how to stop the trans fluid formula to stop retaining moisture and causing issues? The cardboard tough 4L60e trans?

I'm sure it'll be fine given the history with LT1 and LT2 I'm more interested in how the new dfm works vs the lifter based afm that causes so many problems in the truck side.

 

Shame on GM for not making the car 100% idiot proof. It was operator error. There are thousands of fueling fires each year, not just Z06s. Almost invariably it was operator error. I gas mine frequently (not exactly economy based) and have zero anxiety while fueling. No, I don't have the recall performed yet either, don't care if I ever do since I know how to fuel the car.

 

I never burned my C8Z to the ground either.

The point is, they make PLENTY of mistakes even though they test them for hundreds of thousands of miles and for years. It's crazy to me that some of these things (like the fluid in the 8spd trans debacle and the oil leaks and ticking of LT6 AND the original design if the DCT that required another couple quarts!) dont get picked up.

Ill even go one further, the 15 and 16 Z06 didnt come with side skirt deflectors as stsndard equipment and gm was repainting Z06 quarter panels left and right until 17 when they made them standard. Yet they were driving that thing around for how long?

And it isnt like history doesn't repeat itself when you dont learn from it. They knew this going back as far as 1970.

You would think that statement was from C7Z era but it's from 1970. To correct 68and 69 mistakes.

In other words I applaud the engineers but they're not gods.

One more

Thr 500mi LT1 oil change requirement.

Let's not forget that impotant one.

 

I don't think it is even possible for GM to test what will happen once the engines are in git-er-dun mass production mode instead of tender loving care initial production mode.
If such a thing could be done then 1st generation Ford 3.5 turbo's in the F150's wouldn't be feared due to turbo failure issues and the 2nd generation wouldn't be feared for cam phasor issues and you wouldn't pull up an entire list of problems when you do a web search for "GM pickup truck transmission issues" .

Ford took care of me when I had the cam phasor issue (paid $5000 of a $6000 bill when the truck was past warranty). GM seems to be screwing folks with at least one of the truck transmission issues (extending warranty instead of fixing the problem).

Hopefully the new engine won't bring any gremlins along.

 

Probably will. They changed enough to suggest it. Whereas the LT2 was almost identical to LT1 so the bugs were worked out. We are the test bed for the mfrs the days of Lexus and toyota Honda type reliability have been over (even in those brands)

 

And don't forget that the new 6.7 will be built at the brand new Flint engine plant where engines haven't been built for 20 years. All the workers must be trained and certified as well as all the tools and equipment. Could be some serious problems given the lack of experience.

 

Not popular but the truth. The less a human hand assembles anything on the engine the better off we are. This is where you see the LT6 issues. Sealing of surfaces and torquing the cam caps etc. They're under time constraints. Not like a machine shop builder who if they dont like the way something is going together they can redo it. They're just sending the engines at gm and we all know it. It's a testament to the employees and engineers that more dont have issues.