I meant LS6 vs LS2. not LS7. sorry for the typo

thanks

 

delete and recreate with the proper title..

 

Comparing in terms of what? Power? Specs?

The LS6 was an upgrade to the LS1, only offered in the Corvette (and CTS-V I think? ) but not in the F-bodies. It's basically a heads/cam package on the LS1, although it also got its own specific intake manifold (which made its way onto the LS1's anyways). It's a 5.7L, rated at 405 HP, but I think that's under-rated (like most GM's are) since most '02 - '04 Z06's seem to dyno in the ~365 RWHP range, which translates to around ~415 - 420 HP at the flywheel. The first year LS6 (2001) was only rated at 385 HP though (it had a smaller cam and different exhaust configuration than the later years).

The LS2 stepped up to the 6.0L block (4.0" bore, 3.62" stroke, instead of the smaller 3.89" bore). It got a new intake, but the heads/cam? I don't know specifics on those? I know that they're "rated" at 400 HP, but I think in this case it's more accurate, because it seemed that once the '05+ C6's were out, they couldn't come close to the times that the C5 Z06's ran at the track (mid-high 12's, vs. low 12's, in the ~112 mph range vs. ~117 mph range).

GM called the LS2 a "Gen-IV" small block, instead of Gen-III (which the LS1/LS6, and the 4.8 / 5.3 / 6.0L truck engines all were). Pretty much everything is interchangeable between the 2 engines/generations, except they relocated a couple things, like the knock sensors .

Well, I think that's all I know to tell you .

 

so what does the LS2 in the base C6 dyno?

 

I believe I've seen reports of guys dyno-ing in the ~345 - 350 RWHP range typically .

I apologize if my #'s are not "exactly" spec on, but I've lurked around on Corvetteforum.com before , and there seems to be a very good wealth of knowledge over there for 'Vettes, as there is here for F-bodies . I know that early on, the C6 was hard pressed to run any better than ~12.7 or 12.8 . I think a ~12.6 was one of the best times I saw for that car. It's quicker than an LS1 C5 or F-body, but not by much. Meanwhile, there were LOTS of guys posting LOW 12's (anywhere from 12.0 - 12.2) with C5 Z06's.

Lately I haven't been on that forum at all, so I don't know how the stock C6's have been doing with more time in the driver's seat, and more miles on the engine?

And FWIW, the best time I have seen for a STOCK C6 Z06 (w/LS7) was an 11.21 @ 127.xx mph . Some guys have been critical of that, considering the C5 Z06 is capable of high 11's stock, but I think there are/were some torque management issues to work around with the new Z06, as well as needing proper TIRES and I think there may have even been a complaint about the clutch performance at the track? Most of them, however, are posting mid-11's @ ~125 right out of the box with an average driver .