[whiteboyblues2001]

Originally Posted by oldman

the Camaro has lots of room and can easily take a better LT2 style header (probably would need to go Tri-Y becuase of collector thickness, but maybe not). The LT2 cat is NOT close to the head BTW, and a LT2 style intake manifold could be fitted. Bigger TB, larger airbox.
https://www.corvetteblogger.com/2020...e-c8-corvette/
https://www.corvetteforum.com/forums...t2-engine.html

Note I did say "style" as in design parameter, I am not saying LT2 parts fit on the LT1. I am saying there is a reasonable amount of room. Is it worth the engineering cost? Maybe. The LT2 header is worth 5 HP over the cast iron manifold that looks pretty bad in comparison. Most of the HP gain IMO is the exit at the head is nice and smooth and tapered. The second area is the collector looks to be very smooth on transition, the third is the length of the tubes. All of this can be accommodated on the LT1 in the 6th gen, I would say the collector would be the tightest, and Chevy would do a Tri-Y just because of this.
Looking at the pics, I'd say much of the LT2 performace comes form the two HUGE cats:

Here is a link to the reference to the Cats I was talking about:
https://www.roadandtrack.com/new-car...nalysis-specs/

From the article: "The catalytic converters are closer to the exhaust ports, helping to reduce cold-start emissions. The new catalysts allowed Chevy to increase exhaust valve lift by 1mm and duration by 18 degrees, for more exhaust flow."

The Camaro's version of the LT1 already has Try-Y headers. Only the Covette has the manifold. And you will note that the Corvette has 5-10 more HP in it's version of the LT1, so the manifold may be better than the try-y's.

BUT, I agree with your premise that small improvements in intake/exhaust, can boost output enough to justify an LT3. And I think with the Gen6 Camaro getting extended, and LT3 for Camaro would be a good possibility. But, Camaro won't get an LT2, and the LT3 (if it comes) will probably have a little less output than the LT2, but more than the LT1. 480 sounds right, and sounds great to me...

[whiteboyblues2001]

Originally Posted by shaffe

Isn't the LT4 going into the CT5 Blackwing?

but a LT4 SUV or Silverado would be amazing

That's the rumor right now...

[lt4camaro]

Originally Posted by whiteboyblues2001

Here is a link to the reference to the Cats I was talking about:
https://www.roadandtrack.com/new-car...nalysis-specs/

From the article: "The catalytic converters are closer to the exhaust ports, helping to reduce cold-start emissions. The new catalysts allowed Chevy to increase exhaust valve lift by 1mm and duration by 18 degrees, for more exhaust flow."

The Camaro's version of the LT1 already has Try-Y headers. Only the Covette has the manifold. And you will note that the Corvette has 5-10 more HP in it's version of the LT1, so the manifold may be better than the try-y's.

BUT, I agree with your premise that small improvements in intake/exhaust, can boost output enough to justify an LT3. And I think with the Gen6 Camaro getting extended, and LT3 for Camaro would be a good possibility. But, Camaro won't get an LT2, and the LT3 (if it comes) will probably have a little less output than the LT2, but more than the LT1. 480 sounds right, and sounds great to me...

480 is not enough, the mustang bullitt is 480, the new mach 1 is going to be 480, the challenger 392 is 485, chevy camaro needs to stop being the underdog and go at least 490, 5 less than the 495 horse LT2 corvette.

[oldman]

Originally Posted by whiteboyblues2001

Here is a link to the reference to the Cats I was talking about:
https://www.roadandtrack.com/new-car...nalysis-specs/

From the article: "The catalytic converters are closer to the exhaust ports, helping to reduce cold-start emissions. The new catalysts allowed Chevy to increase exhaust valve lift by 1mm and duration by 18 degrees, for more exhaust flow."

I don't own a C7, but my calibrated eyeball tells me the 1st cat on my Camaro is much closer to the exhaust port vs the C8.

Here is the C7 cat, it is hard bolted to a short runner manifold, so nope ain't buying the article. No surprise there.

[oldman]

Originally Posted by whiteboyblues2001

The Camaro's version of the LT1 already has Try-Y headers. Only the Covette has the manifold. And you will note that the Corvette has 5-10 more HP in it's version of the LT1, so the manifold may be better than the try-y's.

highly doubtful., the bottle neck on the Camaro is the 4 cats, mostly the primary cat on driver's side. The C7 has a much nicer cat based down pipe (apparently), as I never measured one up.

Originally Posted by whiteboyblues2001

BUT, I agree with your premise that small improvements in intake/exhaust, can boost output enough to justify an LT3. And I think with the Gen6 Camaro getting extended, and LT3 for Camaro would be a good possibility. But, Camaro won't get an LT2, and the LT3 (if it comes) will probably have a little less output than the LT2, but more than the LT1. 480 sounds right, and sounds great to me...

would agree, GM needs to go with cam in a cam for 535 HP....

[whiteboyblues2001]

Originally Posted by oldman

highly doubtful., the bottle neck on the Camaro is the 4 cats, mostly the primary cat on driver's side. The C7 has a much nicer cat based down pipe (apparently), as I never measured one up.

As for the Camaro, I agree about the cats being the bottleneck, but the fact that there are four instead of two is because two big ones wont fit close enough to the manifold, hence the four cat setup. The two downstream cats won't heat up nearly as quick, so that effects their ability to become effective quickly in a cold start situation.

And, I never saw the 'vette cats, thanks for posting the picture. Looks like it is also a bit of a bottle neck, especially compared to the LT2. The more efficient the cats are isn't just for exhaust throughput though, the faster they heat up, the better cold start emissions are, and the more aggressive a cam you can run, which in turn gives you better performance. Of course, you need the right size plumbing to handle the bigger exhaust lobes on the cam, which Chevy did with the LT2 as well.

would agree, GM needs to go with cam in a cam for 535 HP....

The 376 535 is what you get when you optimize the LT1 without emissions concerns. But that is why it is a racing only application, and are not street legal. The trick is, to somehow handle emissions so efficiently, that you can get as close to the 535 as possible.

Oh yeah, and speaking of Chevy crate engines, have you seen the LS427/570?

This is the first image Chevy released for the Gen6 Camaro, and it is the picture of it's tri-y header.

[Martinjlm]

Originally Posted by whiteboyblues2001

Sorry, my bad, I meant to say "Develop a Camaro only engine" instead of "Make a Camaro only engine".

Does this mean that there is another refresh coming, or do you anticipate this on a new platform?

Would LOVE an LT4 in an SUV! Fun stuff!

This doesn't prove or disprove a next platform. The changes from LT1 to what I'm calling LT3 would not affect packaging at all. Block and head internals.

[Martinjlm]

Originally Posted by oldman

I don't own a C7, but my calibrated eyeball tells me the 1st cat on my Camaro is much closer to the exhaust port vs the C8.

Here is the C7 cat, it is hard bolted to a short runner manifold, so nope ain't buying the article. No surprise there.

Actually, the article does make sense if you look at it from the perspective of the LT1 being an engine developed for Corvette, adapted for use in Camaro. Just like the supercharger for ZL1 was sized to fit under the Z06 hood, even though a larger supercharger could easily fit under the ZL1 hood. LT1 was developed based on Corvette geography. LT3 wouldn’t have to live with that restriction.

[Martinjlm]

Originally Posted by shaffe

Isn't the LT4 going into the CT5 Blackwing?

but a LT4 SUV or Silverado would be amazing

True, the CT5 Blackwing will be LT4. But it isn’t here yet, so LT4 is still a Camaro only engine until CT5 BW and Escalade BW.

[oldman]

Originally Posted by Martinjlm

LT3 wouldn’t have to live with that restriction.

yep,

Now to the 4 cats vs 2 cats. I'm 1000% sure an oval cat would easily fit in the Camaro and yield all the flow needed. But yeah the LT2 cats are HUGE and round and HUGE and straight and round and did I mention HUGE.

[Snowblind]

Originally Posted by oldman

yep,

Now to the 4 cats vs 2 cats. I'm 1000% sure an oval cat would easily fit in the Camaro and yield all the flow needed. But yeah the LT2 cats are HUGE and round and HUGE and straight and round and did I mention HUGE.

You're spot on homie. The face of the c8 cat is 6" and even though its an 800 cell unit, the 300 cell 4" face hi flows netted a minimal gain in comparison. Hats off to GM for such a free flowing unit.

[ZRacerLE]

I'm thinking there will be an LT1 or LT4 or both as options in the upcoming ZRX Silverado. LT1 to fight the raptor. LT4 to fight the TRX.

[RobbyBeefcake87]

Originally Posted by Martinjlm

Actually, the article does make sense if you look at it from the perspective of the LT1 being an engine developed for Corvette, adapted for use in Camaro. Just like the supercharger for ZL1 was sized to fit under the Z06 hood, even though a larger supercharger could easily fit under the ZL1 hood. LT1 was developed based on Corvette geography. LT3 wouldn’t have to live with that restriction.

Damn you Martin. This is good news but throws a monkey wrench in my plans lol. Mod my current ss 1le or wait for the "lt3" and enjoy its modest but nice power bump.

480 isn't all that much but it's enough to garner my attention. Only caviot being that I assume it'll be hard to mod for some time if it has one of those tricky new ecu's.

[BlaqWhole]

Why stop at 480 tho? GM has shown that they're not above giving the Camaro every bit of power that the Vette has. They would have to actually spend resources turning it back. It would be stupid. Just send it. Throw all 490 at it.