he also has a dyno of a 567whp lsvtec stock sleeves..but even ask him..this isnt normal nor would he recommend pushin that much...if u want to turbo ur car..get pistons rods..the sleeves should be find upwards of 400whp..however they might not and they might be able to withstand higher then that..just get some 9:1 pistons forged rods turbo it for about 300whp(anything more then that u might have a problem with the ls head..bcuz its goin to take more boost to make 300whp then it would with a vtec head on there..and with to much boost on a stock head could cause floating valve..correct me if iim wrong but im pretty sure this is right) other things to consider...also note in these high whp stock sleeve numbers..they are not running 93 oct..and most likely u will be if u want this to be a DD car