They are older 170's, but Woody at Fordstrokers freshened them up and installed new springs/retainers for the person I bought them from. The PO never dyno'd the engine, and he ran it carbed as well. I will be happy if it makes 400 rwhp, and 375+ rwtq. I really have no idea what to expect, because the heads are older, and I dont read cam grind language. From what the PO told me, it is more of a high end screamer than a stump puller. I may swap rear end gears if need be. We'll see. I will be dynoing it next summer once I have the rest of my support mods installed (exhaust, TB, ignition). This summer is just about getting it in the car and running.