For kicks I just went to Mondello's site. They link to a magazine article titled Overkill. Not. 11:1 comp., Ebrock heads, cryogenic hardening etc. netted them 544 @ 459700 HP and 568@4400 tq. Nice wide torque curve too. But dang, we used to beat that with a 383 stroked to 472 using nothing but OEM parts from the junkyard and a solid cam. But hey, Olds guys are never known for the good decision making skills.