Some kills
I initially stated that the LS1 should pull on the RT even with some mods.
My buddy had an bolt-on 01 Cobra (stock 3.27 gears) and raced an 08 RT Charger and got him in in each race (vids on Youtube). I also know that an LS1 should give a 01 Cobra a good run for its money so I am basing my statement on those scenarios.
I usually am not the one to post random Youtube races but from time to time, I do catch videos from Thirdhonk. Recently KFCOrBust posted a modded RT Challenger vs some Mustangs and a modded 2010 SS Camaro. The RT had a little bit of a hard time with a couple of cars.
Again, I am not trying to discredit the RT but I am more trying to state that your LS1 should still pull a mildly modded RT. As for the SRT 6.1 and 392, that might be a different story though.
The Ws6 in the above pic is really clean. Love the hoods on it and that top pic shows it off well. Very nice!



