Emarine, that sounds like it would be right around 500, My approach is pretty close to that with my 341" except I've got bowl ported/pinch relieved E-heads, Comp HR 236/242 @.50 .520/.540 on 112 in at 107 (need to spread the torque for obvious reasons) aluminum rods and 10.2:1, I'm looking for ~460 @ maybe 6300 or so, by my calcs that should be pretty close...whatcha think?