Does any know for a fact what heads are on the L76? It seems like consensus is that they are the same as the L92 heads, but that consensus seems to come more from hope than fact. It seems that those heads would be good for more than 362 even with a factory tune/cam.

I haven't heard anything...

I am 95% sure these are the L92 heads because the L76 intake will only fit l92 style heads

Does any know for a fact what heads are on the L76? It seems like consensus is that they are the same as the L92 heads, but that consensus seems to come more from hope than fact. It seems that those heads would be good for more than 362 even with a factory tune/cam.

I'm pretty sure the compression ratio and camshaft are the only things holding this engine back. I don't know about the bottom-end VS the LS2 since this engine doesn't seem to be rated near the LS2's RPM range but I'm sure we'll find out in the near future.

The L76 is the same bore and stroke as an LS2. My question arises because the LS2 people seem to be foaming at the mouth to bolt up L92 heads and L76 intake, which would, except for the cam, be an L76 (if in fact the L76 uses L92 heads). If the L76 is rated at 362, the LS2 people would be giving up 38hp if they are essentially bolting on all the components (sans cam) as an L76. Unless theres a piece I am simply overlooking, the L76 must have either an extremely mild cam, the lower compression is killing its output, or it has heads other than the L92s.

The L76 is the same bore and stroke as an LS2. My question arises because the LS2 people seem to be foaming at the mouth to bolt up L92 heads and L76 intake, which would, except for the cam, be an L76 (if in fact the L76 uses L92 heads). If the L76 is rated at 362, the LS2 people would be giving up 38hp if they are essentially bolting on all the components (sans cam) as an L76. Unless theres a piece I am simply overlooking, the L76 must have either an extremely mild cam, the lower compression is killing its output, or it has heads other than the L92s.

C P: You bring up an awesome analogy! I hope you are totally right. I'm not going to pretend to know a ton about engines, but with a more agressive cam & what else would make this engine better than the LS2?

the L76/L92 setups do indeed use the new heads from the 6.2l motors. The really great news is that by the time these cars are on the lot at dealers folks will be make sick power and have the cam specs pretty well figured out. I have a couple cam designs for L76/L92 setups if anyone is interested.
I sure am, start a new topic as to not go OT?

So is there any confirmation about the heads being L92's?

The L76 is the same bore and stroke as an LS2. My question arises because the LS2 people seem to be foaming at the mouth to bolt up L92 heads and L76 intake, which would, except for the cam, be an L76 (if in fact the L76 uses L92 heads). If the L76 is rated at 362, the LS2 people would be giving up 38hp if they are essentially bolting on all the components (sans cam) as an L76. Unless theres a piece I am simply overlooking, the L76 must have either an extremely mild cam, the lower compression is killing its output, or it has heads other than the L92s.

Tuning, the L76 is tuned to run on 87 octane, the LS2 is tuned to run on 91. So a cam and a tune for high octane should make this thing into a beast.

How is DOD going to affect putting a cam in and tuning though?

Tuning, the L76 is tuned to run on 87 octane, the LS2 is tuned to run on 91. So a cam and a tune for high octane should make this thing into a beast.

Agreed, that is probably an X factor. I thought about that, but forgot to update the thread. Looks like good things are on the horizon.

How is DOD going to affect putting a cam in and tuning though?

From what I understand, there are some specific kind of camshaft roller (they ride on the camshaft & push the rocker arms-I can't think of what they are called) that can be made to not open the valves. This (along with the computer's tune) allow for driving on 4 cylinders in AFM mode. When a new cam is installed, I presume that those can be replaced with more traditional parts. Also, I presume that the computer can be tuned to ignore the AFM signals so as not to set off an SES light.

I am 95% sure these are the L92 heads because the L76 intake will only fit l92 style heads

I have a hard time believing that the L76 runs the L92 heads. I would think that we should be able to see a lot more power than 362 out of this motor if that was the case. I could be wrong, but I would be suprised to find out that these are the L92 heads - there was a lot of work that went into those heads, as they were originially for the new Z06, until they stepped up to the LS7.

I have a hard time believing that the L76 runs the L92 heads. I would think that we should be able to see a lot more power than 362 out of this motor if that was the case. I could be wrong, but I would be suprised to find out that these are the L92 heads - there was a lot of work that went into those heads, as they were originially for the new Z06, until they stepped up to the LS7.
The LS7 heads are CNC'd L92's so it's numbers are better but they both are basically the same.

From what I've read I think you will be surprised with the L76 ;)

Well I would guess the HP tuners folks are working on it with the aussie cars as we speak
The L98 varient used in the Commodore does not have DOD.

I am almost positive the heads for the L76 are the same as the ones for the L92. The L92 is the 6.2L version that is currently being used in trucks in the US, while the L76 is being used in the australian cars. Since the L76 intake is the required intake for cars running these heads (the intake ports are different than those in the rest of the LS series engines), I think it is pretty safe to say they are the same.

The main problem I see is that the compression ratio must be significantly lower, and I would guess the cheapest and easiest way to make that happen is through using dished pistons. This could seriously hamper ones ability to make serious power through just a cam switch. Might be able to mill the heads to increase the compression, but that is a bit more work...

Greg

10.4 TO 1 is the compression ratio.

I am almost positive the heads for the L76 are the same as the ones for the L92. The L92 is the 6.2L version that is currently being used in trucks in the US, while the L76 is being used in the australian cars. Since the L76 intake is the required intake for cars running these heads (the intake ports are different than those in the rest of the LS series engines), I think it is pretty safe to say they are the same.

The main problem I see is that the compression ratio must be significantly lower, and I would guess the cheapest and easiest way to make that happen is through using dished pistons. This could seriously hamper ones ability to make serious power through just a cam switch. Might be able to mill the heads to increase the compression, but that is a bit more work...

Greg

How about a slimmer HG or a cam with an early IVC ?

the L76/L92 setups do indeed use the new heads from the 6.2l motors. The really great news is that by the time these cars are on the lot at dealers folks will be make sick power and have the cam specs pretty well figured out. I have a couple cam designs for L76/L92 setups if anyone is interested.

Your right about the heads. my local tuner suggested a port on the stock heads, CAI, headers and a cat back could push 420hp or so (after break in) at the wheels, without touching the cam. he just did the same to an ls2 GTO and got a 45 hp boost at the wheels. he thinks more will come from the L76 because of the L92 heads.

btw, what are you cam suggestions for the l76

I saw an ls2 GTO with just bolt ons headers with ported L92 heads on the STOCK cam push out 418rwhp

Right from GM's Engine Website if that helps at all.

High-Flow Cylinder Heads
The Gen IV 6.0L (L76) is fitted with high-flow cylinder heads, based on those developed for the high-performance LS2 and LS6 car V8s. These heads have offset rockers, like those in the LS7. They also have larger valves than the Vortec 6.0L V8 heads used in truck applications, and increase airflow in and out of the engine for higher horsepower. Yet the 6.0L (L76) heads maintain a compression ratio and calibrations that allow these engines to operate on regular gas.

Interesting....

A buddy from GMPP gave me a set of these heads and I never asked where they were going....:secret:

Ed