So I looked but didn't really find what I am looking for... Is the 6.0L engine in the GT a LS2 or what? I have a TBSS now with the LS2 6.0L motor and was wondering if this is the same motor...


Z

no its actually an L76

L76
1. ls2 block
2. ls3 intake
3. L98 heads(baby LS7 as they say)
4. AFM (active fuel managment)

BUT you can make as much HP with just a good tune.... (stock 361HP)

So can most of the parts for the LS2 fit on this motor? Like heads and stuff?

You couldn't want LS2 heads on the GT's motor since the stock heads and intake are already superior. LS2 guys are buying our heads and intakes with their cams because it's an awesome bang-for-the-buck mod.

The L76 is very tame and will wake up with minimal mods.....it's gonna be a hit!

no its actually an L76

L76
1. ls2 block
2. ls3 intake
3. L98 heads(baby LS7 as they say)
4. AFM (active fuel managment)

BUT you can make as much HP with just a good tune.... (stock 361HP)

they are L92 heads and L76 intake. The LS3 uses the same (different valve train) L92 heads and L76 intake.

I don't understand the "numbers" you guys are using... And if these heads are soo much better, why does the motor have less HP than me now?

GM is hitting the market with a ton of different part numbers. This is good and bad.

Good because it allows for a lot of OEM performance upgrades.

Bad because it causes a ton of confusion.

The LS2 is basically a 6.0 liter LS6.

The L76 is a completely different configuration of parts.

Back in the late 90's and early 2000 you had the LS1. It was so much easier describing part numbers.

I don't understand the "numbers" you guys are using... And if these heads are soo much better, why does the motor have less HP than me now?

Cylinder compression and Cam :gears:

-Greg

Cylinder compression and Cam :gears:

-Greg

So a cam change and a tune should get the L76 to higher numbers than the SS-V/VXR8?

So a cam change and a tune should get the L76 to higher numbers than the SS-V/VXR8?

A CAM and a tune will put you past an LS3!!!

The LS2 is basically a 6.0 liter LS6.


the ls6 is the 5.7 which shares the same bore as a ls1... the ls2 and ls7 share the same bore so you can swap the ls7 heads on a ls2, but you cannot swap ls6/1 heads (and why would you anyways)

so it seems best bang for the buck will be found in a cam/tune on the l76 - along with maybe a full exhaust.

Best bang for the buck is forget the cam for now. A Vector tune puts you at about 400HP at the crank, and from what I hear from the one lucky owner of said tuned car, he picked up a couple MPGs too.

400 crank isn't enough - it wasn't enough when i had my ls2 based gto - why would it be enough in an even heavier car? :)

the ls6 is the 5.7 which shares the same bore as a ls1... the ls2 and ls7 share the same bore so you can swap the ls7 heads on a ls2, but you cannot swap ls6/1 heads (and why would you anyways)

The LS2 and the LS7 do not share the same bore. The LS2 is 4.00 in and the LS7 is 4.125 in. That's a large difference. The L76/LS3 both have a 4.06 in bore FYI.

so it seems best bang for the buck will be found in a cam/tune on the l76 - along with maybe a full exhaust.
400 crank isn't enough - it wasn't enough when i had my ls2 based gto - why would it be enough in an even heavier car? :)

If you owned/own a LS series engine you all ready know what the best bang for the buck mods are. All the typical bolt on mods- headers, exhaust, tune, UD pulley, air intake, etc. A cam will also not just be a "cam" change with the DOD. You'll probably need to replace the lifters, the valley tray, the lifter trays, and different timing gear, maybe even push rods. Depending on the lobes and lift you will need valve springs also. Not that all of that is expensive per say, it's just not the best bang for the buck.

i didn't keep the car long enough to do anything to it (sold it 4 months after buying it) - sold it to my best friend - he skipped all the bolt ons and went right for the GT67 sts kit... 100% stock motor aside from injectors made 505whp/550wtq @ 8.5psi...

i didn't keep the car long enough to do anything to it (sold it 4 months after buying it) - sold it to my best friend - he skipped all the bolt ons and went right for the GT67 sts kit... 100% stock motor aside from injectors made 505whp/550wtq @ 8.5psi...

Well do some research then on ls1tech.com and you'll see what the various bolt ons give the L/LS engines. If you follow the ls3 then you should be able to get about 100HP from bolt on's.

the ls6 is the 5.7 which shares the same bore as a ls1... the ls2 and ls7 share the same bore so you can swap the ls7 heads on a ls2, but you cannot swap ls6/1 heads (and why would you anyways)

What? :banghead:

There's no chance in hell an LS7 head bolting onto the 4.00 inch bore of the LS2.

As I said before, the LS2 is basically a 6.0 liter LS6 as it has the 2001 LS6 cam and LS6 heads (minus sodium filled vales). What it lacks is the LS6 manifold and thats a shame because the LS2 manifold takes some serious porting to make it work. Then again the LS2 manifold accepts the 90mm throttle body.

What? :banghead:

There's no chance in hell an LS7 head bolting onto the 4.00 inch bore of the LS2.

As I said before, the LS2 is basically a 6.0 liter LS6 as it has the 2001 LS6 cam and LS6 heads (minus sodium filled vales). What it lacks is the LS6 manifold and thats a shame because the LS2 manifold takes some serious porting to make it work. Then again the LS2 manifold accepts the 90mm throttle body.

i was wrong about the ls2 and ls7 having the same bore, HOWEVER.. you CAN swap the heads... there were several rx7 guys who did this mod because of the cost difference between buying a complete ls7 vs a ls2

LS7 heads will not fit on a 4.00 inch bore engine.

L92 heads (baby LS7 heads) will fit on a 4" bore engine.

If your RX7 guys were able to get stock LS7 heads to fit a stock LS2 bore then they have found the performance bargain of the century that no performance shop (LPE, Callaway, Mallett, Katech, etc) knows about.

The LS7 head requires a 4.125 bore to accept the 2.20 valves.

The L92 heads use slightly smaller 2.16 valves and will fit.

You would need to resleeve the LS2 as I believe you can't bore it out much more that what is stock.

Sure you can get LS7 heads to "fit" an LS2 block, but not with the stock sleeves and bore.

LS7 heads will not fit on a 4.00 inch bore engine.

L92 heads (baby LS7 heads) will fit on a 4" bore engine.

If your RX7 guys were able to get stock LS7 heads to fit a stock LS2 bore then they have found the performance bargain of the century that no performance shop (LPE, Callaway, Mallett, Katech, etc) knows about.

The LS7 head requires a 4.125 bore to accept the 2.20 valves.

The L92 heads use slightly smaller 2.16 valves and will fit.

You would need to resleeve the LS2 as I believe you can't bore it out much more that what is stock.

Sure you can get LS7 heads to "fit" an LS2 block, but not with the stock sleeves and bore.

FTW...exactly...

TBSS does not have a LS2, it's block is based on the LS2 that's all. I've driven a prototype LS3 G8 GXP M6 coming this fall, it had full exhaust, headers, CAI, and a tune and put down an extra 60bhp\45tq over stock of 402\402. This puppy rocks!!! Throw in a cam and you're at 510 bhp. throw in a D-1sc at 9 psi, FAST and you're looking at 705+ bhp. Smoke every other 4-door exotic sedan out there and go hunting for ZR1's. Now that's what I'm talking about.

the TBSS has an LS2 in it... i know, i owned one... and it was worked on extensively by GM master techs who said it was an LS2...

TBSS does not have a LS2, it's block is based on the LS2 that's all. I've driven a prototype LS3 G8 GXP M6 coming this fall, it had full exhaust, headers, CAI, and a tune and put down an extra 60bhp\45tq over stock of 402\402. This puppy rocks!!! Throw in a cam and you're at 510 bhp. throw in a D-1sc at 9 psi, FAST and you're looking at 705+ bhp. Smoke every other 4-door exotic sedan out there and go hunting for ZR1's. Now that's what I'm talking about.

You could do the exact same thing with a L76 engine too, for less.

Besides the above these cars come very detuned from the factory to meet certain emissions and gas mileage ratings to avoid the gas guzzler tax.
On top of that the car runs very rich to avoid any issues within the motor and the car has no timing put into it.
With a good tuner you could pick up 25 to 40 hp at the crank just buy recalculating a few things such as timing and air to fuel ratio curve.
Last you could get rid of most ot torque management which will wake the car up.
kerley

TBSS does not have a LS2, it's block is based on the LS2 that's all.

since when? every TBSS I've ever seen had a LS2 in it not to mention that is exactly what mine has in it. now if you're saying its not a LS2 just because it's not exactly like what came in the vette or GTO, you could say the same thing about a lot of cars like the B-body LT1 HHR SS vs. Solstice and so on. you have to make some changes in a motor when you stick it in a truck:)

gETTING mY TUNE , CAI on friday...
....possibly a cam...I have to investigage the one they wanna use first.I will post dyno results I am being realistic...I am predicting Ill pull just short of 300 rwhp stock..and mabye pick up 25 or so HP..I havent seen anyone really make 40 hp from just a tune ( on a stock NA motor)..Ive been told getting 10 hp from the CAI will be about it...IF it hit 330 rwhp I will be happy...the cam maybe another 30 hp on the top end...
theres always nos to try out next pay period after this friday :)

gETTING mY TUNE , CAI on friday...
....possibly a cam...I have to investigage the one they wanna use first.I will post dyno results I am being realistic...I am predicting Ill pull just short of 300 rwhp stock..and mabye pick up 25 or so HP..I havent seen anyone really make 40 hp from just a tune ( on a stock NA motor)..Ive been told getting 10 hp from the CAI will be about it...IF it hit 330 rwhp I will be happy...the cam maybe another 30 hp on the top end...
theres always nos to try out next pay period after this friday :)

Did you ever get a cam or any other top end mods? If so, what did you get?

Jim