Originally Posted by George C
actually the difference in the LS6 vs the LS1 are the following..
the intake is difference depending on the yr
the heads are different the LS6 use a 243 casting and have longer valves which are sodium filled, the combustion chamber is smaller netting higher cr
the ls6 is 10.6 vs the ls1 being 10.1
the block has a minor difference to it [casting] some of the later yr fbodys had gotten a Ls6 block but you would need to run numbers to see what block you have
the better intake is the GMT800 intake, there is plenty of dyno sheets and data that show the GMT800 intake outflows and performs and makes more power up top...Now if you find a GMT900 intake that is 90mm it will out perform all others.
This is straight from Wikipedia: The LS6
is a higher-output version of GM's LS1 engine and retains the same capacity. The initial 2001 LS6 produced 385 bhp (287 kW) and 385 lbf·ft (522 N·m), but the engine was modified for 2002 through 2004 to produce 405 bhp (302 kW) and 400 lbf·ft (540 N·m) of torque. The LS6 was originally only used in the high-performance C5 Corvette
Z06 model, with the Cadillac CTS V-Series
getting the 400 bhp (300 kW) engine later. The V-Series used the LS6 for two years before being replaced by the LS2 in 2006. For 2006, the Z06 replaced the LS6 with the new LS7
. The LS6 shares its basic block architecture with the GM LS1 engine
, but other changes were made to the design such as windows cast into the block between cylinders, improved main web strength and bay to bay breathing, an intake manifold and MAF-sensor with higher flow, a camshaft with higher lift and more duration, a higher compression ratio of 10.5:1, sodium filled valves, and a revised oiling system better suited to high lateral acceleration.
LS6 intake manifolds were also used on all 20012002 LS1 engines. The casting number, located on the top rear edge of the block, is 12561168. Applications:
Your #'s are a little off and you forgot about the cam and I really dont think the valves are longer why would they even need to be longer? And only the exhaust valves are filled with sodium and if anyone out there thinks that those valves are making more power you can keep on thinking that and maybe they do a very small amount but one of the main reasons GM is using them is for engine harmonics to keep vibration and noise down. I know this only because I have been to GM training classes on engine building. They use sodium filled valves in even the Chevy Cruise and Malibu.