This. Those extra .2L make a world of difference. It's funny cause the L76 actually could be seen as a transitional engine between the LS2 and LS3 as far as parts go. The L76 has the LS2's block but has the heads of an L98 which was then in turn used on the LS3.First thing that comes to my mind would be displacement. I know it's not much, but as the old saying goes, "there's no replacement for displacement". I would also have to assume, crank, rods and possibly other internal parts that might be lighter and stronger. Just my thoughts.
What is the difference in gearing? Are you talking the transmission or just the rear?More displacement
Lighter valve train
Better gearing in the LS3 cars
I think this might be the key. The larger bore.The .2 liters of displacement are nice but its the larger bore that's the real key. It unshrouds the valves and lets it breath.
Please bear with me, I'm fresh off the boat new to GM stuff. The L76 has LS2 bottom end with LS3 top end right? But the valvetrain isn't the same as LS3 right? So other than that are the L76 ports and style identical to the LS3?LS3 Heads flow better than just about anything else
Indeed, the 3.45 or the 3.27 in my opinion need to be a priority. The 2.92 is a very nice hwy setup, but personally I have purchased a 3.27 Camaro setup to help from a dig. This will be going in shortly along with all new suspension components. I also have stock heads fully machined and ported by TSP. Very nice work!!:grin2:Looks like 3.45 Camaro diff needs to be high on the priority list for me...
Oh I plan to have a dig monster. >Indeed, the 3.45 or the 3.27 in my opinion need to be a priority. The 2.92 is a very nice hwy setup, but personally I have purchased a 3.27 Camaro setup to help from a dig. This will be going in shortly along with all new suspension components. I also have stock heads fully machined and ported by TSP. Very nice work!!:grin2:
That doesn't explain why CAMMED L76 cars can barely keep up with LS3 cars.It's really the valve train that makes the biggest difference in the performance between these engines. Displacement of 10 cubic inches is not going to make a 60+ horsepower difference! Numerous 6.0 owners have installed LS 3 cams & Valve Springs in otherwise stock engines and have produced similar power levels. One only needs to look at the Lift and Duration of the L76 cam vs LS3 and you will see the glaring difference.
Exactly, the two engines are very similar, its not the crank or rods or even the heads castings. The LS3 has the same rod length and stroke as our L76. The head casting can also be the exact same casting used on both engines, if you were lucky. I got 5364 castings on my G8 which are not as desirable the 823's that some G8s came with. And yes its true that the LS3 heads have hollow stem intake valves, which are lighter and give better upper rpm head room with a bigger cam. (I added them to my heads when I got mine ported for this reason.)That doesn't explain why CAMMED L76 cars can barely keep up with LS3 cars.