I have read through this whole thread and was worried about my short block I bought from DynoFlo. I bought a 434 from Scott back in Jan 07. I just got done with the rest of the assembly a few weeks ago and dynoed it this past weekend @ Bob Wirth R&D in hayward Ca. I am very pleased with my motor. It made 602hp @ 6300rpm, and 559lbs @ 5000rpm. All the valvetrain and heads came from my 406. I am pleased with Scott's work. I picked the motor up from Scott when we picked up my freinds 582ci that made 959hp. We watched Scott dyno it. I am very happy with DynoFlo's work!