So, now that the GXP is gonna have the LS3, why do you want it?

Other than it will likely have somewhere around 420 hp vs. 361 hp with full warranty. But give the L76, some exhaust work, CAI, Tune ~ 400 hp pretty darn close...

What else makes the LS3 (or the L76) a better choice?

I am guessing the LS3 is pretty well tuned for Premium vs. L76...

Only way to get a manual.

Only way to get a manual.

Yep, me too. If the GXP is the only way to get a manual transmission, then that is the way I will go. If they ever offer the manual with a G8 GT, I would rather do that for the cheaper cost. I can then mod the car later to attain more power for less money. I hear great things about the LS3, but it sounds like the L76 is no slouch either. The engine doesn't matter as much to me as the tranny.

Just me but I would love to see how the L76 with a Maggie compares to the LS3.

I love low end torque and with the lower compression ratio of the L76 it sounds like it would turn out NICE!

It is sad to have to make an engine 'choice' because of tranny options. LS3 for me too....

If the GT could be had with the Tremec, I'd have taken the more laid back L76 unless the price delta to the LS3 was less than 2k$

for me it would depend on fuel and what not. if the GXP with LS3 gets acceptable gas mileage and has to burn premium i guess i could go that route to get the 400+ horses. but if it gets crappy mileage and has to burn premium then id be fine with 362HP.

I'm most concerned with the durability of each with a supercharger. If the LS3 is said to be a much better engine for boosting in terms of reliability and final power, I might go with the GXP, but if the L76 lasts as long and has near as much power boosted, I think the GT will suite me just fine, especially if there's a price difference of $7k loaded.

I would of been happy with a GT manual too. A L76 with a maggie would kill a stock LS3. The LS3 and the L76 have all most identical heads. The L76 has lower compresion. It would be the better boost candidate. The major difference would be the 200cc. I don't know if the LS3 is getting DOD, I hope not.

I would of been happy with a GT manual too. A L76 with a maggie would kill a stock LS3. The LS3 and the L76 have all most identical heads. The L76 has lower compresion. It would be the better boost candidate. The major difference would be the 200cc. I don't know if the LS3 is getting DOD, I hope not.
To be fair, a S/C LS3 would be more powerful than a S/C L76 (well, at least probably),
but to be fair, a S/C GT will cost as much as a stock GXP (well, at least probably).

and to continue being fair, I suppose the S/C GT will lack the warranty that the GXP has. Although, I do wonder. If you had the dealer install an aftermarket S/C kit for $$, would the warranty necessarily be void or would it be up to them?

So, now that the GXP is gonna have the LS3, why do you want it?

Other than it will likely have somewhere around 420 hp vs. 361 hp with full warranty. But give the L76, some exhaust work, CAI, Tune ~ 400 hp pretty darn close...

What else makes the LS3 (or the L76) a better choice?

I am guessing the LS3 is pretty well tuned for Premium vs. L76...


The LS3 runs on regular gasoline compare to the LS2 knowing GM the HP should be around 430HP stock unless tuning the LS3 for premium well over 450HP. GXP LS3 and manual what a perfect combination.

A L76 with a maggie would kill a stock LS3..

And an LS3 with a maggie would kill a L76 with a maggie.

You can't compare stock to a retune or modified car. Its not fair.

Bottom line, you get more HP without having to void warranties. Anything that you add, that causes a problem? That problem will not be covered under warranty. So even if you add a CAI, and something arises from your work; this is just hypothetical - you're screwed/

You see, some of us don't like the prospect of shelling out over 30,000 dollars on a car, and then spending another thousand or so to make some modifications only to have to spend a few thousand more because you mucked something up and the warranty was as a result shot.

You see, some of us don't like the prospect of shelling out over 30,000 dollars on a car, and then spending another thousand or so to make some modifications only to have to spend a few thousand more because you mucked something up and the warranty was as a result shot.

Here, Here! I'll stand with this gentleman! The wallet is not bottomless for many of us, and getting the car we want, built by those who, at least are supposed to know what they are doing, is the point of spending all that money in the first place!:iagree:

Both are great motors. The numbers the LS3's are putting down (stock and bolt-ons) are just simply impressive! For me, the L76 isn't enough. I would end up having to mod it, and would then void the warranty. With the LS3, any mods would be VERY minor, thus allowing me to keep my warranty. I figure on a L76, it would take a CAI, LT Headers, Cat-back, underdrive pulley, and a 93 octane tune just to run with a STOCK GXP.

Bottom line, you get more HP without having to void warranties. Anything that you add, that causes a problem? That problem will not be covered under warranty. So even if you add a CAI, and something arises from your work; this is just hypothetical - you're screwed/

You see, some of us don't like the prospect of shelling out over 30,000 dollars on a car, and then spending another thousand or so to make some modifications only to have to spend a few thousand more because you mucked something up and the warranty was as a result shot.

This is one very important point. When some of the first GTOs were brought to dealers with K & N air filters, some dealers refused to warranty. IIRC, the problem was the filter oil was getting carried into the intake & gumming up the throttle body. Now, there are other high flow air filters that don't require filter oil. But, if I can get the higher HP without having to pay too much over the GT, I'll take it. Plus, my GTO already has 400hp, so either I'd have to mod the L76 or buy a car with the LS3. Plus, I have read that the LS3 is more suited as a high performance engine. The L76 is designed to be a good performer, but is designed as a more cost effective engine for mass production.

Plus, the manual transmission.

One thing to note is that on the GMPP website, the info for the L92 heads says that they require a MINIMUM 4.00" bore. The L76 has a 4.001" bore, while the LS3 has a 4.060" bore. My guess is that the L76 probably has some valve shrouding issues that the LS3 doesn't. This is probably part of the reason the LS3 makes 66 hp per liter, while the L76 only makes 60.