LS= stronger block, better torque, lower compression ratio (good for turbo) you will be able to run higher psi wth the LS...


GSR= weaker block (it will prolly crack before the LS), higher compression ratio, which means less psi, unless u dump a shitload of money into it for tuning (and i mean FINE tuning), the higher insurance would make somewhat of a diff. maybe not for some


basically you can put less money into an LS and get just as good of not better results. the only agrument i can think of would be a smaller turbo in either car so that it will spool up faster and give you a little bit better edge at the beginning of your run...thats pretty much all i have to say about that...