no, the LS has lower compression (mid 9-s vs. high 10-s for the gsr) and no vtec aka no high revs.

the LS is a fantastic engine for a turbo car due to the lower compression and easier tuning, with a little more torque.

the GSR is even better as a boosted engine due to the oil squirters keeping the pistons slightly coolerm the better breathing of a vtec head, higher compression means less boost per hp.

ls vtec isn't bad my buddy made 391 whp @15-16 psi on pump gas with a mildly built ls/vtec. you just might as well go forged internals and some other beefy good stuff while you're building it.