**600hp sbm block limit? Or is it bs!!**

I have about 50 passes on the 390, and the only reason I opened it up was to change the oil pan to fit my Dart.

Now, I'm not making that kind of power, but I am not worried about it in the slightest bit. It's well balanced, and I don't have to spin a boatload of RPM to make good power, so that's a good recipe for a long life.

I am also a big fan of using the best parts (within reason) you can afford when you build an engine.

Fast, Reliable, Cheap

Pick any 2.