I doubt that it would flow as well as a ported LS head. It will bolt up to your LS block, but unless you want a spare head to build up and then throw on your car when it's done, I wouldn't bother. Even porting a stock LS head and putting it on won't really do much for your car's performance by itself unless you have other things like cams/valvesprings&retainers/intakemani/tb/etc to complement the porting.