DSS Cobra said:the 5.3 is crazy, its a all aluminum long block with d.s.s. CNC fully ported heads, stage III cams and a fully built bottom end from d.s.s. all motor it put down 522 rwhp and 548 rwtq and that was without a blower. and i haven't heared to much about the 5.1 but i know the 5.3 2V stroker kit is rated to put down around mid 400 rwhp. so i would go with that if you have a 2V motor