Well, it was originally an Indy Cylinder Heads 415 Crate motor rated at 520 h.p. Find that a bit hard to believe with an camshaft intake duration of 236 degrees. I'm a bit worried about these rods too as mentioned, I think the crankshaft has already been replaced before and I don't know what the cause was (bought from an estate type sale, owner deceased). Eagles site says up to 500 h.p., Scat claims 650 h.p. on their rods. Just something to help you sleep better at night?