Quote Originally Posted by 1.8t
Remember the LS3 is 6.2l and has a whole HOST of upgrades over an 6l LS2. If you want I can link you to all the improvements. The heads on this car are VERY good and are equivalent to having a nice set of worked over heads in regards to the LS2. That is the biggest advantage this motor has. CNC'd LS3 heads only net 10hp or so. Many people are using stock LS3 heads on their head/cam LS2's now because they are much less expensive than really worked aftermarket heads and are almost as good. Pretty cool stuff
a whole bunch of people were really pissed cause a i/c/e + tune ls3 will make more rwhp than a ls6 z06 with the same mods and some even with the addition of heads also